Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female? (a) Maintenance of the hypertrophical endometrial lining (b) Maintenance of high concentration of sex- hormones in the blood stream (c) Retention of well-developed corpus luteum (d) Fertilisation of the ovum

Which one of the following is the most likely root
cause why menstruation is not taking place in
regularly cycling human female?
(a) Maintenance of the hypertrophical endometrial
lining
(b) Maintenance of high concentration of sex-
hormones in the blood stream
(c) Retention of well-developed corpus luteum
(d) Fertilisation of the ovum
by

1 Answer

Answer :

(b) Maintenance of high concentration of sex-
hormones in the blood stream
by

Related questions

Which one of the following is the correct matching of the events occurring during menstrual cycle? (a) Proliferative phase : Rapid regeneration of myometrium and maturation of Graafian follicle (b) Secretory phase : Development of corpus luteum and increased secretion of progesterone (c) Menstruation : Breakdown of myometrium and ovum not fertilised (d) Ovulation : LH and FSH attain peak level and sharp fall in the secretion of progesterone

Description : Which one of the following is the correct matching of the events occurring during menstrual cycle? (a) Proliferative phase : Rapid regeneration of myometrium and maturation of Graafian follicle (b) ... ) Ovulation : LH and FSH attain peak level and sharp fall in the secretion of progesterone

Last Answer : (b) Secretory phase : Development of corpus luteum and increased secretion of progesterone

Identify the hormone with its correct matching of source and function. (a) Oxytocin - posterior pituitary, growth and maintenance of mammary glands. (b) Melatonin - pineal gland, regulates the normal rhythm of sleepwake cycle. (c) Progesterone - corpus luteum, stimulation of growth and activities of female secondary sex organs. (d) Atrial natriuretic factor - ventricular wall, increases the blood pressure.

Description : Identify the hormone with its correct matching of source and function. (a) Oxytocin - posterior pituitary, growth and maintenance of mammary glands. (b) Melatonin - pineal gland, regulates the ... sex organs. (d) Atrial natriuretic factor - ventricular wall, increases the blood pressure.

Last Answer : (b) Melatonin - pineal gland, regulates the normal rhythm of sleepwake cycle

(i)Explain the events taking place at the time of fertilisation of an ovum in a human female. (ii)Trace the development of the zygote up to its implantation in the uterus. (iii)Name and draw a labelled sectional view of the embryonic stage that gets implanted. -Biology

Description : (i)Explain the events taking place at the time of fertilisation of an ovum in a human female. (ii)Trace the development of the zygote up to its implantation in the uterus. (iii)Name and draw a labelled sectional view of the embryonic stage that gets implanted. -Biology

Last Answer : (i)In humans, the fertilisation of ovum takes place in ampullary-isthmic junction of Fallopian tube. The events that occur during the process of fertilisation are: (a) The sperm reaches the ... endometrium of the uterus. This is called implantation.(iii) Blastocyst stage implants in the uterus.

Match the items given in column I with those in column II and select the correct option given below. Column I Column II A. Proliferative phase (i) Breakdown of endometrial lining B. Secretory phase (ii) Follicular phase C. Menstruation (iii) Luteal phase A B C (a) (iii) (ii) (i) (b) (i) (iii) (ii) (c) (ii) (iii) (i) (d) (iii) (i) (ii)

Description : Match the items given in column I with those in column II and select the correct option given below. Column I Column II A. Proliferative phase (i) Breakdown of endometrial lining B. Secretory phase (ii) Follicular phase C. Menstruation ( ... ) (i) (iii) (ii) (c) (ii) (iii) (i) (d) (iii) (i) (ii)

Last Answer : (c) (ii) (iii) (i)

If mammalian ovum fails to get fertilised, which one of the following is unlikely? (a) Corpus luteum will disintegrate. (b) Progesterone secretion rapidly declines. (c) Estrogen secretion further increases. (d) Primary follicle starts developing.

Description : If mammalian ovum fails to get fertilised, which one of the following is unlikely? (a) Corpus luteum will disintegrate. (b) Progesterone secretion rapidly declines. (c) Estrogen secretion further increases. (d) Primary follicle starts developing.

Last Answer : (c) Estrogen secretion further increases.

Sex is determined in human beings (a) by ovum (b) at time of fertilisation (c) 40 days after fertilisation (d) seventh to eight week when genitals differentiate in fetus.

Description : Sex is determined in human beings (a) by ovum (b) at time of fertilisation (c) 40 days after fertilisation (d) seventh to eight week when genitals differentiate in fetus.

Last Answer : (b) at time of fertilisation

The duration 19-21 days refers to: (1) incubation period of hen's egg (2) average life-span of a red blood cell in humans (3) the period of menstrual cycle soon after menstruation, during which fertilisation is most likely to occur (4) period of completion of one schizogony cycle of malarial parasite inside a red blood cell

Description : The duration 19-21 days refers to: (1) incubation period of hen's egg (2) average life-span of a red blood cell in humans (3) the period of menstrual cycle soon after menstruation, during ... to occur (4) period of completion of one schizogony cycle of malarial parasite inside a red blood cell

Last Answer : (3) the period of menstrual cy-cle soon after menstruation, during which fertilisation is most likely to occur Explanation: The menstrual cycle is the scientific term for the physiological changes ... 21 days or more between a woman's shortest and longest cycle lengths is considered very irregular

The duration 19-21 days refers to: (1) incubation period of hen’s egg (2) average life-span of a red blood cell in humans (3) the period of menstrual cycle soon after menstruation, during which fertilisation is most likely to occur (4) period of completion of one schizogony cycle of malarial parasite inside a red blood cell

Description : The duration 19-21 days refers to: (1) incubation period of hen's egg (2) average life-span of a red blood cell in humans (3) the period of menstrual cycle soon after menstruation, during ... to occur (4) period of completion of one schizogony cycle of malarial parasite inside a red blood cell

Last Answer : the period of menstrual cycle soon after menstruation, during which fertilisation is most likely to occur

Select the option which correctly matches the endocrine gland with its hormone and its function. Endocrine Hormone Function gland (a) Placenta Estrogen Initiates secretion of the milk (b) Corpus Estrogen Essential for luteum maintenance of endometrium (c) Leydig’s Androgen Initiates the cells production of sperms (d) Ovary FSH Stimulates follicular development and the secretion of estrogens

Description : Select the option which correctly matches the endocrine gland with its hormone and its function. Endocrine Hormone Function gland (a) Placenta Estrogen Initiates secretion of the milk (b) Corpus ... of sperms (d) Ovary FSH Stimulates follicular development and the secretion of estrogens

Last Answer : (c) Leydig’s Androgen Initiates the cells production of sperms

Assertion : Corpus luteum is present in proliferative phase of menstrual cycle . Reason : High concentration of progesterone is present in proliferati

Description : Assertion : Corpus luteum is present in proliferative phase of menstrual cycle . Reason : High concentration of progesterone is present in proliferati

Last Answer : Assertion : Corpus luteum is present in proliferative phase of menstrual cycle . Reason : High ... . If both Assertion & Reason are False.

(a) IN WHICH PART OF HUMAN FEMALE REPRODUCTIVE SYSTEM DO THE FOLLOWING EVENTS TAKE PLACE. (i) RELEASE OF FIRST POLAR BODY (ii) RELEASE OF SECOND POLAR BODY (iii) FERTILISATION (iv) IMPLANTATION (b) NAME TWO HORMONES SECREATED ONLY DURING PREGNANCY.

Description : (a) IN WHICH PART OF HUMAN FEMALE REPRODUCTIVE SYSTEM DO THE FOLLOWING EVENTS TAKE PLACE. (i) RELEASE OF FIRST POLAR BODY (ii) RELEASE OF SECOND POLAR BODY (iii) FERTILISATION (iv) IMPLANTATION (b) NAME TWO HORMONES SECREATED ONLY DURING PREGNANCY.

Last Answer : ANS (a) (i) OVARY (ii) FALLOPIAN TUBE (iii) AMPULLA-ISTHAMUS JUNCTION OF FALLOPIAN TUBE (iv) ENDOMETRIUM LINING OF UTERUS (b) HUMAN CHORIONIC GONADOTROPIN AND HUMAN PLACENTAL LACTOGEN

years old female with regular menses. On US, she has a 7cm ovarian cyst. otherwise everything is normal. dx: a. corpus luteum cyst b.follicular cyst c.teratoma d.another cancer

Description : years old female with regular menses. On US, she has a 7cm ovarian cyst. otherwise everything is normal. dx: a. corpus luteum cyst b.follicular cyst c.teratoma d.another cancer

Last Answer : b.follicular cyst

Which one of the following statements is incorrect about menstruation? (a) At menopause in the female, there is especially abrupt increase in gonadotropic hormones. (b) The beginning of the cycle of menstruation is called menarche. (c) During normal menstruation about 40 mL blood is lost. (d) The menstrual fluid can easily clot.

Description : Which one of the following statements is incorrect about menstruation? (a) At menopause in the female, there is especially abrupt increase in gonadotropic hormones. (b) The beginning of the cycle of ... normal menstruation about 40 mL blood is lost. (d) The menstrual fluid can easily clot.

Last Answer : (d) The menstrual fluid can easily clot.

Assertion : The menstrual flow results due to breakdown of endometrial lining of the uterus and its blood vessels . Reason : Rapid fall in the level o

Description : Assertion : The menstrual flow results due to breakdown of endometrial lining of the uterus and its blood vessels . Reason : Rapid fall in the level o

Last Answer : Assertion : The menstrual flow results due to breakdown of endometrial lining of the uterus and its blood ... D. If both Assertion & Reason are False.

A regular cycling woman is not menstruating which one of the following is the most likely root cause of this?

Description : A regular cycling woman is not menstruating which one of the following is the most likely root cause of this?

Last Answer : A regular cycling woman is not menstruating which one of the following is the most likely root ... D. Retention of well dev eloped corpus luteum.

Which one of the following statements about human sperm is correct? (a) Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilisation. (b) The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilisation. (c) Acrosome serves as a sensory structure leading the sperm towards the ovum. (d) Acrosome serves no particular function

Description : Which one of the following statements about human sperm is correct? (a) Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilisation. (b) The ... a sensory structure leading the sperm towards the ovum. (d) Acrosome serves no particular function

Last Answer : (b) The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilisation.

In human beings after fertilisation , the structure which gets embedded in the wall of uterus is a) ovum b)embryo c)foetus d)zygote

Description : In human beings after fertilisation , the structure which gets embedded in the wall of uterus is a) ovum b)embryo c)foetus d)zygote

Last Answer : b)embryo

Draw a diagrammatic sectional view of human ovary showing different stages of oogenesis along with corpus luteum. (ii) Where is morula formed in human? Explain the process of its development from zygote. -Biology

Description : Draw a diagrammatic sectional view of human ovary showing different stages of oogenesis along with corpus luteum. (ii) Where is morula formed in human? Explain the process of its development from zygote. -Biology

Last Answer : (i) Sectional view of human ovary. (ii) Morula is formed in the (a)Isthmus of the oviduct (Fallopiantube). (b)The zygote undergoes mitotic divisions in quick succession called cleavage, forming 2, 4 ... 8-16 blastomeres is called a morula and the inner cell mass gets ready to form the embryo proper.

The main function of mammalian corpus luteum is to produce (a) estrogen only (b) progesterone (c) human chorionic gonadotropin (d) relaxin only.

Description : The main function of mammalian corpus luteum is to produce (a) estrogen only (b) progesterone (c) human chorionic gonadotropin (d) relaxin only.

Last Answer : (b) progesterone

The figure shows a section of human ovary. Select the option which gives the correct identification of either A  or  B with function/characteristic(a) B- Corpus luteum - Secretes progesterone (b) A- Tertiary follicle - Forms Graafian follicle (c) B- Corpus luteum - Secretes estrogen (d) A- Primary oocyte - It is in the prophase I of the meiotic division

Description : The figure shows a section of human ovary. Select the option which gives the correct identification of either A  or  B with function/characteristic (a) B- Corpus luteum - Secretes progesterone (b) A- ... Secretes estrogen (d) A- Primary oocyte - It is in the prophase I of the meiotic division

Last Answer : (a) B- Corpus luteum - Secretes progesterone

A temporary endocrine gland in the human body is (a) corpus cardiacum (b) corpus luteum (c) corpus allatum (d) pineal gland.

Description : A temporary endocrine gland in the human body is (a) corpus cardiacum (b) corpus luteum (c) corpus allatum (d) pineal gland.

Last Answer : b) corpus luteum

A temporary endocrine gland in the human body is : (1) Corpus cardiacum (2) corpus luteum (3) Corpus allatum (4) Pineal gland

Description : A temporary endocrine gland in the human body is : (1) Corpus cardiacum (2) corpus luteum (3) Corpus allatum (4) Pineal gland

Last Answer : (2) corpus luteum

Blood pressure is controlled by – (1) Adrenal gland (2) Thyroid gland (3) Thymus (4) Corpus luteum

Description : Blood pressure is controlled by – (1) Adrenal gland (2) Thyroid gland (3) Thymus (4) Corpus luteum

Last Answer : (1) Adrenal gland Explanation: Adrenaline directly affects, regulates and determines the body's ability to maintain a healthy blood pressure. When the adrenal gland becomes damaged or ... greatly increases blood pressure levels, causing severe headaches, weight loss and other serious problems.

Match the source gland with its respective hormone and function and select the correct option. Source Hormone Function gland (a) Anterior Oxytocin Contraction of uterus pituitary muscles during child birth (b) Posterior Vasopressin Stimulates pituitary reabsorption of water in the distal tubules in the nephron (c) Corpus Estrogen Supports pregnancy luteum (d) Thyroid Thyroxine Regulates blood calcium level

Description : Match the source gland with its respective hormone and function and select the correct option. Source Hormone Function gland (a) Anterior Oxytocin Contraction of uterus pituitary muscles during ... (c) Corpus Estrogen Supports pregnancy luteum (d) Thyroid Thyroxine Regulates blood calcium level

Last Answer : (b) Posterior Vasopressin Stimulates pituitary reabsorption of water in the distal tubules in the nephron

Blood pressure is controlled by (1) Adrenal gland (2) Thyroid gland (3) Thymus (4) Corpus Luteum

Description : Blood pressure is controlled by (1) Adrenal gland (2) Thyroid gland (3) Thymus (4) Corpus Luteum

Last Answer : Adrenal gland

The term ‘Test Tube Baby’ implies (a) Fertilisation of ovum takes place I the test tube but it develops in uterus (b) Fertilisation of ovum takes place in the test tube and develops in the test tube itself (c) Fertilisation of the ovum takes place in the uterus but develops in the test tube (d) Fertilisation takes place in uterus and embryo develops in uterus

Description : The term Test Tube Baby' implies (a) Fertilisation of ovum takes place I the test tube but it develops in uterus (b) Fertilisation of ovum takes place in the test tube and develops in ... uterus but develops in the test tube (d) Fertilisation takes place in uterus and embryo develops in uterus

Last Answer : Ans:(a)

Assertion : Estrogen level is high during the follicular phase of menstrual cycle . Reason : During this phase corpus luteum secrete large amount of e

Description : Assertion : Estrogen level is high during the follicular phase of menstrual cycle . Reason : During this phase corpus luteum secrete large amount of e

Last Answer : Assertion : Estrogen level is high during the follicular phase of menstrual cycle . Reason : During this ... D. If both Assertion & Reason are False.

Withdrawal of which of the following hormones is the immediate cause of menstruation?

Description : Withdrawal of which of the following hormones is the immediate cause of menstruation?

Last Answer : Withdrawal of which of the following hormones is the immediate cause of menstruation? A. Estrogen B. FSH C. FSH-RH D. Progesterone

Withdrawal of which of the following hormones is the immediate cause of menstruation? (a) Progesterone (b) Estrogen (c) FSH (d) FSH-RH

Description : Withdrawal of which of the following hormones is the immediate cause of menstruation? (a) Progesterone (b) Estrogen (c) FSH (d) FSH-RH

Last Answer : (a) Progesterone

(i) Mention the event that induces the completion of the meiotic division of the secondary oocyte. (ii) Trace the journey of the ovum from the ovary, its fertilisation and further development until the implantation of the embryo. -Biology

Description : (i) Mention the event that induces the completion of the meiotic division of the secondary oocyte. (ii) Trace the journey of the ovum from the ovary, its fertilisation and further development until the implantation of the embryo. -Biology

Last Answer : (i)Secondary oocyte completes meiosis-ll only when a sperm enters its cytoplasm. It forms a larger cell, the ootid and a small cell, the second polar body. (ii)The secondary oocyte is ... and inner cell mass.The trophoblast attacheds to endometrium (implantation) and blastocyst gets embedded in it.

Explain the events that occur during fertilisation of an ovum in humans. How is it that only one sperm enters the OVUm? -Biology

Description : Explain the events that occur during fertilisation of an ovum in humans. How is it that only one sperm enters the OVUm? -Biology

Last Answer : (i)In humans, the fertilisation of ovum takes place in ampullary-isthmic junction of Fallopian tube. The events that occur during the process of fertilisation are: (a) The sperm reaches the ... that blocks the entry of additional sperms. This ensures that only one sperm can fertilise an ovum

How is the entry of only one sperm ensured into an ovum during fertilisation in humans? -Biology

Description : How is the entry of only one sperm ensured into an ovum during fertilisation in humans? -Biology

Last Answer : During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes (depolarisation) in the membrane that blocks the entry of additional sperms. This ensures that only one sperm can fertilise an ovum

From a to d which of the following statements are correct ? (a) Fertilisation can occur only if the ovum and sperm are transported simultaneously to t

Description : From a to d which of the following statements are correct ? (a) Fertilisation can occur only if the ovum and sperm are transported simultaneously to t

Last Answer : From a to d which of the following statements are correct ? (a) Fertilisation can occur only if the ovum and sperm ... b and c C. c and d D. b and d

The technique called Gamete Intra Fallopian Transfer (GIFT) is recommended for those females (a) who cannot produce an ovum (b) who cannot retain the fetus inside uterus (c) whose cervical canal is too narrow to allow passage for the sperms (d) who cannot provide suitable environment for fertilisation.

Description : The technique called Gamete Intra Fallopian Transfer (GIFT) is recommended for those females (a) who cannot produce an ovum (b) who cannot retain the fetus inside uterus (c) whose cervical ... narrow to allow passage for the sperms (d) who cannot provide suitable environment for fertilisation.

Last Answer : (a) who cannot produce an ovum

The stage transferred into the uterus after induced fertilisation of ovum in the laboratory is (a) embryo at 4 blastomeres stage (b) embryo at 2 blastomeres stage (c) morula (d) zygote.

Description : The stage transferred into the uterus after induced fertilisation of ovum in the laboratory is (a) embryo at 4 blastomeres stage (b) embryo at 2 blastomeres stage (c) morula (d) zygote.

Last Answer : (c) morula

What happens during fertilisation in humans after many sperms reach close to the ovum? (a) Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida. (b) All sperms except the one nearest to the ovum lose their tails. (c) Cells of corona radiata trap all the sperms except one. (d) Only two sperms nearest the ovum penetrate zona pellucida.

Description : What happens during fertilisation in humans after many sperms reach close to the ovum? (a) Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida. (b) All sperms except ... all the sperms except one. (d) Only two sperms nearest the ovum penetrate zona pellucida.

Last Answer : (a) Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida.

Capacitation refers to changes in the (a) ovum after fertilisation (b) sperm after fertilisation (c) sperm before fertilisation (d) ovum before fertilisation.

Description : Capacitation refers to changes in the (a) ovum after fertilisation (b) sperm after fertilisation (c) sperm before fertilisation (d) ovum before fertilisation.

Last Answer : (c) sperm before fertilisation

Fertilisation in humans is practically feasible only if (a) the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the cervix (b) the sperms are transported into cervix within 48 hrs of release of ovum in uterus (c) the sperms are transported into vagina just after the release of ovum in fallopian tube (d) the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the fallopian tube.

Description : Fertilisation in humans is practically feasible only if (a) the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the cervix (b) the sperms are transported ... the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the fallopian tube.

Last Answer : (d) the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the fallopian tube.

Extrusion of second polar body from egg occurs (a) simultaneously with first cleavage (b) after entry of sperm but before fertilisation (c) after fertilisation (d) before entry of sperm into ovum.

Description : Extrusion of second polar body from egg occurs (a) simultaneously with first cleavage (b) after entry of sperm but before fertilisation (c) after fertilisation (d) before entry of sperm into ovum.

Last Answer : (b) after entry of sperm but before fertilisation

Endosperm is formed during the double fertilisation by (a) two polar nuclei and one male gamete (b) one polar nuclei and one male gamete (c) ovum and male gamete (d) two polar nuclei and two male gametes.

Description : Endosperm is formed during the double fertilisation by (a) two polar nuclei and one male gamete (b) one polar nuclei and one male gamete (c) ovum and male gamete (d) two polar nuclei and two male gametes.

Last Answer : (a) two polar nuclei and one male gamete

What is corpus luteum? -Biology

Description : What is corpus luteum? -Biology

Last Answer : answer:

What is corpus luteum? -Biology

Description : What is corpus luteum? -Biology

Last Answer : answer:

What is corpus luteum ?

Description : What is corpus luteum ?

Last Answer : : The part of the graphene follicle that is in the ovary after ovulation is called corpus lutea .

During pregnancy degeneration of corpus luteum is prevented by the hormone

Description : During pregnancy degeneration of corpus luteum is prevented by the hormone

Last Answer : During pregnancy degeneration of corpus luteum is prevented by the hormone A. hCG B. hPL C. LH, estrogen and estradiol D. Relaxin.

Corpus luteum releases

Description : Corpus luteum releases

Last Answer : Corpus luteum releases A. Androgen B. Progesterone C. Estrogen D. Both B and C.

Which hormone is not produced by corpus luteum

Description : Which hormone is not produced by corpus luteum

Last Answer : Which hormone is not produced by corpus luteum A. Progesterone B. Estradiol C. Inhibin D. Relaxin

Assertion. Corpus luteum is produced by Graafian follicle after ovulation Reason. It secretes estrogen which is necessory to maintain pregnancy.

Description : Assertion. Corpus luteum is produced by Graafian follicle after ovulation Reason. It secretes estrogen which is necessory to maintain pregnancy.

Last Answer : Assertion. Corpus luteum is produced by Graafian follicle after ovulation Reason. It secretes estrogen which is necessory to ... A. A B. B C. C D. D

Corpus luteum produces

Description : Corpus luteum produces

Last Answer : Corpus luteum produces A. Lutenizing hormone B. Progesterone C. Luteotrophic hormone D. Inhibin.

Distingeration of corpus luteum occurs due to inhibiton of secretion of hormone

Description : Distingeration of corpus luteum occurs due to inhibiton of secretion of hormone

Last Answer : Distingeration of corpus luteum occurs due to inhibiton of secretion of hormone A. LTH B. FSH C. Progesterone D. LH.

Assertion : If fertilization dies not occur than the corpus luteum begins to degenerate . Reason : The levels of progesterone and estrogen decline due

Description : Assertion : If fertilization dies not occur than the corpus luteum begins to degenerate . Reason : The levels of progesterone and estrogen decline due

Last Answer : Assertion : If fertilization dies not occur than the corpus luteum begins to degenerate . Reason : The ... D. If both Assertion & Reason are False.