The following structures are of ectodermal origin: a. the retina and its retinal pigment epithelium b. iris stroma c. the sclera d. the ciliary muscle e. the corneal stroma

The following structures are of ectodermal origin:
a. the retina and its retinal pigment epithelium
b. iris stroma
c. the sclera
d. the ciliary muscle
e. the corneal stroma
by

1 Answer

Answer :

the retina and its retinal pigment epithelium
by

Related questions

The cells of the retinal pigment epithelium: a. are of mesenchymal origin b. are shorter at the fovea than else where in the retina c. have intracellular melanosomes d. regenerate visual pigment e. form the inner outer blood-retina barrier

Description : The cells of the retinal pigment epithelium: a. are of mesenchymal origin b. are shorter at the fovea than else where in the retina c. have intracellular melanosomes d. regenerate visual pigment e. form the inner outer blood-retina barrier

Last Answer : have intracellular melanosome

True statements about chloroquine include: a. is safer than hydroxychloroquine at equivalent dose b. can cause corneal deposition c. causes posterior subcapsular cataract d. chloroquine is bound to the melanin of the retinal pigment epithelium e. causes reversible toxic maculopathy

Description : True statements about chloroquine include: a. is safer than hydroxychloroquine at equivalent dose b. can cause corneal deposition c. causes posterior subcapsular cataract d. chloroquine is bound to the melanin of the retinal pigment epithelium e. causes reversible toxic maculopathy

Last Answer : can cause corneal deposition

The following are true about tight junction: a. it forms a barrier to water b. it is found in the blood-aqueous barrier of the ciliary body c. it is found in the blood-retinal barrier at the apex of the retinal pigment epithelium d. all above

Description : The following are true about tight junction: a. it forms a barrier to water b. it is found in the blood-aqueous barrier of the ciliary body c. it is found in the blood-retinal barrier at the apex of the retinal pigment epithelium d. all above

Last Answer : all above

The following cells contribute the wavefronts of the flash ERG: a. retinal pigment epithelium b. corneal endothelium c. photoreceptors d. ganglion cell

Description : The following cells contribute the wavefronts of the flash ERG: a. retinal pigment epithelium b. corneal endothelium c. photoreceptors d. ganglion cell

Last Answer : photoreceptors

Regarding retinal metabolism: a. insulin is essential for the uptake of glucose by the retina b. anaerobic metabolism predominates c. the pigment retinal epithelium stores glycogen and supplies the need of the retina d. the demand of oxygen is met entirely by the central retinal artery

Description : Regarding retinal metabolism: a. insulin is essential for the uptake of glucose by the retina b. anaerobic metabolism predominates c. the pigment retinal epithelium stores glycogen and supplies the need of the retina d. the demand of oxygen is met entirely by the central retinal artery

Last Answer : anaerobic metabolism predominates

With regard to the blood retina barrier: a. the outer blood retina is formed by the retinal pigment epithelium cells and their junctions b. the blood retina barrier is typically defective in the immediate perpapillary region c. the retinal vascular endothelial cells can actively transport fluid and anions from the extracellular space of the retina into the circulation d. all above

Description : With regard to the blood retina barrier: a. the outer blood retina is formed by the retinal pigment epithelium cells and their junctions b. the blood retina barrier is typically defective in the ... fluid and anions from the extracellular space of the retina into the circulation d. all above

Last Answer : all above

In retinal detachment, fluid accumulates between: a. Outer plexiform layer and inner nuclear layer. b. Neurosensory retina and layer of retinal pigment epithelium c. Nerve fiber layer and rest of retina. d. Retinal pigment epithelium and Bruch’s membrane.

Description : In retinal detachment, fluid accumulates between: a. Outer plexiform layer and inner nuclear layer. b. Neurosensory retina and layer of retinal pigment epithelium c. Nerve fiber layer and rest of retina. d. Retinal pigment epithelium and Bruch’s membrane.  

Last Answer : ANSWER: B 

Aqueous humour is formed by: a. Epithelium of ciliary body b. Posterior surface of iris c. Lens d. Pars plana

Description : Aqueous humour is formed by: a. Epithelium of ciliary body b. Posterior surface of iris c. Lens d. Pars plana

Last Answer : ANSWER: A

True statements about EOG (electro-oculogram) include: a. the EOG light-peak to dark-trough ratio is reduced in central retinal vein occlusion b. the light peak of EOG is abnormal in Best's disease c. the EOG light rise is produced by depolarization of the basal membrane of the retinal pigment epithelium d. all above

Description : True statements about EOG (electro-oculogram) include: a. the EOG light-peak to dark-trough ratio is reduced in central retinal vein occlusion b. the light peak of EOG is abnormal in Best' ... rise is produced by depolarization of the basal membrane of the retinal pigment epithelium d. all above

Last Answer : all above

The following are true about electroretinogram (ERG): a. the a-wave has negative deflection b. a wave is generated by the retinal pigment epithelium c. amacrine cells are responsible for the oscillatory potential d. it is possible to separate the cone and rod ERG

Description : The following are true about electroretinogram (ERG): a. the a-wave has negative deflection b. a wave is generated by the retinal pigment epithelium c. amacrine cells are responsible for the oscillatory potential d. it is possible to separate the cone and rod ERG

Last Answer : t is possible to separate the cone and rod ERG

The following are true about electroretinogram: a. the a-wave is produced by the photoreceptors b. the b-wave is produced by the ganglion cells c. c-wave is produced by the retinal pigment epithelium d. different light frequencies can be used to separate rod and cone respons

Description : The following are true about electroretinogram: a. the a-wave is produced by the photoreceptors b. the b-wave is produced by the ganglion cells c. c-wave is produced by the retinal pigment epithelium d. different light frequencies can be used to separate rod and cone respons

Last Answer : he a-wave is produced by the photoreceptors

The following are true about electroretinogram: a. the a-wave is produced by the photoreceptors b. the b-wave is produced by the ganglion cells c. c-wave is produced by the retinal pigment epithelium d. different light frequencies can be used to separate rod and cone response

Description : The following are true about electroretinogram: a. the a-wave is produced by the photoreceptors b. the b-wave is produced by the ganglion cells c. c-wave is produced by the retinal pigment epithelium d. different light frequencies can be used to separate rod and cone response

Last Answer : the a-wave is produced by the photoreceptors

The retinal pigment epithelium (RPE): a. is sensitive to hypervitaminosis A b. isomerizes all-trans-retinal to 11-cis-retinol c. does not undergo mitosis in response to injury d. secrets the outer layer of the basal lamina that forms the Bruch's membrane.

Description : The retinal pigment epithelium (RPE): a. is sensitive to hypervitaminosis A b. isomerizes all-trans-retinal to 11-cis-retinol c. does not undergo mitosis in response to injury d. secrets the outer layer of the basal lamina that forms the Bruch's membrane.

Last Answer : isomerizes all-trans-retinal to 11-cis-retinol

The retinal pigment epithelium cells: a. esterify and store excess retinol b. transport retinol binding protein from blood to subretinal space c. are secured laterally to each other by tight junction d. all above

Description : The retinal pigment epithelium cells: a. esterify and store excess retinol b. transport retinol binding protein from blood to subretinal space c. are secured laterally to each other by tight junction d. all above

Last Answer : all above

In which part of the eye lies the pigment that decides the colour of the eyes of a person--? A. Retina B. Iris (Answer) C. Cornea D. Pupal

Description : In which part of the eye lies the pigment that decides the colour of the eyes of a person--? A. Retina B. Iris (Answer) C. Cornea D. Pupal

Last Answer : B. Iris (Answer)

Which of the following organs is innervated only by parasympathetic nerves ? (a) Iris muscles (b) Ciliary muscle (c) Sweat glands (d) Splenic capsule

Description : Which of the following organs is innervated only by parasympathetic nerves ? (a) Iris muscles (b) Ciliary muscle (c) Sweat glands (d) Splenic capsule

Last Answer : Ans: B

Which of the following organs is innervated only by parasympathetic nerves: A. Iris muscles B. Ciliary muscle C. Sweat glands D. Splenic capsule

Description : Which of the following organs is innervated only by parasympathetic nerves: A. Iris muscles B. Ciliary musclele C. Sweat glands D. Splenic capsu

Last Answer : B. Ciliary musclele

Which of the following organs is innervated only by parasympathetic nerves: A. Iris muscles B. Ciliary muscle C. Sweat glands D. Splenic capsule

Description : Which of the following organs is innervated only by parasympathetic nerves: A. Iris muscles B. Ciliary muscle C. Sweat glands D. Splenic capsule

Last Answer : B. Ciliary muscle

Photoreceptors (Rods and cones) of eye are present in (a) Sclera (b) Cornea (c) Retina (d) Pupil

Description : Photoreceptors (Rods and cones) of eye are present in (a) Sclera (b) Cornea (c) Retina (d) Pupil

Last Answer : (c) Retina

The corneal stroma: a. measures 500 um thick b. transmits 90% of the incoming light c. derives most of its oxygen from the precorneal tear film d. is acellular which accounts for its transparency

Description : The corneal stroma: a. measures 500 um thick b. transmits 90% of the incoming light c. derives most of its oxygen from the precorneal tear film d. is acellular which accounts for its transparency

Last Answer : measures 500 um thick

The endothelium: a. maintains the integrity of the corneal stroma through an ATP-Na+, K+-dependent pump b. receives its nutrient from the blood vessels surrounding the cornea c. undergoes multiplication in response to trauma d. contains tight junction between adjacent endothelium

Description : The endothelium: a. maintains the integrity of the corneal stroma through an ATP-Na+, K+-dependent pump b. receives its nutrient from the blood vessels surrounding the cornea c. undergoes multiplication in response to trauma d. contains tight junction between adjacent endothelium

Last Answer : maintains the integrity of the corneal stroma through an ATP-Na+, K+-dependent pump

Koeppe’s nodules are found in: a. Cornea b. Sclera c. Iris d. Conjunctiva

Description : Koeppe’s nodules are found in: a. Cornea b. Sclera c. Iris d. Conjunctiva

Last Answer : ANSWER: C 

After 48 hours of a cataract extraction operation, a patient complained of ocular pain and visual loss. On examination, this eye looked red with ciliary injection, corneal oedema and absent red reflex. The first suspicion must be: a. Secondary glaucoma. b. Anterior uveitis. c. Bacterial endophthalmitis. d. Acute conjunctivitis

Description : After 48 hours of a cataract extraction operation, a patient complained of ocular pain and visual loss. On examination, this eye looked red with ciliary injection, corneal oedema and absent red ... a. Secondary glaucoma. b. Anterior uveitis. c. Bacterial endophthalmitis. d. Acute conjunctivitis  

Last Answer : ANSWER: C

The sure diagnostic sign of corneal ulcer is a. Ciliary injection b. Blepharospasm c. Miosis d. Positive fluorescein test.

Description : The sure diagnostic sign of corneal ulcer is a. Ciliary injection b. Blepharospasm c. Miosis d. Positive fluorescein test.  

Last Answer : ANSWER: D 

Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions characteristics. (a) C-Aqueous chamber-Reflects the light which does not pass through the lens. (b) D - Choroid - Its anterior part forms ciliary body. (c) A - Retina - Contains photoreceptors, i.e., rods and cones. (d) B - Blind spot-Has only a few rods and cones.

Description : Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions characteristics. (a) C-Aqueous chamber-Reflects the light which does not ... , i.e., rods and cones. (d) B - Blind spot-Has only a few rods and cones.

Last Answer : (c) A - Retina - Contains photoreceptors, i.e., rods and cones.

The following are true about the cornea: a. the stroma contains collagen fibrils of regular thickness b. the Bowman's layer contains randomly arranged collagen fibrils c. the Bowman's layer is the basement layer of the epithelium d. type I collagen is the main type of collagen found in the cornea

Description : The following are true about the cornea: a. the stroma contains collagen fibrils of regular thickness b. the Bowman's layer contains randomly arranged collagen fibrils c. the Bowman's layer is the ... layer of the epithelium d. type I collagen is the main type of collagen found in the cornea

Last Answer : type I collagen is the main type of collagen found in the cornea

Which part of ovary in mammals acts as an endocrine gland after ovulation? (a) Stroma (b) Germinal epithelium (c) Vitelline membrane (d) Graafian follicle

Description : Which part of ovary in mammals acts as an endocrine gland after ovulation? (a) Stroma (b) Germinal epithelium (c) Vitelline membrane (d) Graafian follicle

Last Answer : (d) Graafian follicle

Assertion : Originwise hair are epithelial tissue which are of ectodermal origin. Reason : Epithelial tissue can be formed from mesoderm and endoderm

Description : Assertion : Originwise hair are epithelial tissue which are of ectodermal origin. Reason : Epithelial tissue can be formed from mesoderm and endoderm

Last Answer : Assertion : Originwise hair are epithelial tissue which are of ectodermal origin. Reason : Epithelial ... . If both Assertion & Reason are false.

Pancreas in origin is (a) Ectodermal (b) Mesodermal (c) Endodermal (d) Ecto-mesodermal

Description : Pancreas in origin is (a) Ectodermal (b) Mesodermal (c) Endodermal (d) Ecto-mesodermal

Last Answer : (c) Endodermal

Liver is (a) Ectodermal in origin (b) Endodermal in origin (c) Mesodermal in origin (d) None

Description : Liver is (a) Ectodermal in origin (b) Endodermal in origin (c) Mesodermal in origin (d) None

Last Answer : (b) Endodermal in origin

When viewing an object near to your eyes the following are required for proper image formation of the retina ? (A) Contraction of the ciliary muscles

Description : When viewing an object near to your eyes the following are required for proper image formation of the retina ? (A) Contraction of the ciliary muscles

Last Answer : When viewing an object near to your eyes the following are required for proper image formation of the retina ? (A) ... and D C. B and D D. A and B

With regard to the cornea: a. photokeratitis occurs with wavelength of 270nm b. microvilli are found in the outer layer of the epithelium c. the turnover of the corneal epithelium typically takes 30 days d. the corneal epithelium is about 10 layers in thickness

Description : With regard to the cornea: a. photokeratitis occurs with wavelength of 270nm b. microvilli are found in the outer layer of the epithelium c. the turnover of the corneal epithelium typically takes 30 days d. the corneal epithelium is about 10 layers in thickness

Last Answer : photokeratitis occurs with wavelength of 270nm

Bacteria, which can attack normal corneal epithelium: a. Neisseria gonorrhea. b. Staphylococcal epidermidis c. Moraxella lacunata. d. Staphylococcal aureus

Description : Bacteria, which can attack normal corneal epithelium: a. Neisseria gonorrhea. b. Staphylococcal epidermidis c. Moraxella lacunata. d. Staphylococcal aureus 

Last Answer : ANSWER: A

Which of the following organism can penetrate intact corneal epithelium? A. Strept pyogenes B. Staph aureus C. Pseudomonas pyocyanaea D. Corynebacterium diphtheriae

Description : Which of the following organism can penetrate intact corneal epithelium? A. Strept pyogenes B. Staph aureus C. Pseudomonas pyocyanaea D. Corynebacterium diphtheriae 

Last Answer : ANSWER: D

The transparent lens in the human eye is held in its place by (a) ligaments attached to the ciliary body (b) ligaments attached to the iris (c) smooth muscles attached to the iris (d) smooth muscles attached to the ciliary body

Description : The transparent lens in the human eye is held in its place by (a) ligaments attached to the ciliary body (b) ligaments attached to the iris (c) smooth muscles attached to the iris (d) smooth muscles attached to the ciliary body

Last Answer : (a) ligaments attached to the ciliary body

The transparent lens in the human eye is held in its place by (1) ligaments attached to the ciliary body (2) ligaments attached to the iris (3) smooth muscles attached to the iris (4) smooth muscles attached to the ciliary body

Description : The transparent lens in the human eye is held in its place by (1) ligaments attached to the ciliary body (2) ligaments attached to the iris (3) smooth muscles attached to the iris (4) smooth muscles attached to the ciliary body

Last Answer : (1) ligaments attached to the ciliary body

Dense scar of cornea with incarceration of iris is known as: a. Adherent Leucoma b. Dense leucoma c. Ciliary staphyloma d. Iris bombe

Description : Dense scar of cornea with incarceration of iris is known as: a. Adherent Leucoma b. Dense leucoma c. Ciliary staphyloma d. Iris bombe

Last Answer : ANSWER: A 

In binocular vision: a. only points on the horopter fall on the corresponding retinal point b. points in front of the horopter will stimulate binasal retina c. points outside the horopter is perceived doubly d. the Panum's fusional area is wider in the centre than the periphery e. sensory fusion refers to the cortical integration of images perceived by the two eyes

Description : In binocular vision: a. only points on the horopter fall on the corresponding retinal point b. points in front of the horopter will stimulate binasal retina c. points outside the horopter ... the periphery e. sensory fusion refers to the cortical integration of images perceived by the two eyes

Last Answer : only points on the horopter fall on the corresponding retinal point

The following are true about ocular circulation: a. only 4% of the total blood supply to the eye goes to the retina b. the choroidal blood flow in normal people is ten times that of the grey mater of the brain c. autoregulation occurs in both retinal and choroidal circulation d. a PaCO2 rise of 1 mm Hg induces a 3% rise in retinal blood flow

Description : The following are true about ocular circulation: a. only 4% of the total blood supply to the eye goes to the retina b. the choroidal blood flow in normal people is ten times that of the grey mater ... and choroidal circulation d. a PaCO2 rise of 1 mm Hg induces a 3% rise in retinal blood flow

Last Answer : a PaCO2 rise of 1 mm Hg induces a 3% rise in retinal blood flow

Purkinje's shift: a. refers to the transition of retinal sensitivity between photopic and scotopic vision b. refers to the shift in the spectral sensitivity of the human retina toward shorter wavelengths of light c. accounts for blue colour appearing brighter at dusk d. all above

Description : Purkinje's shift: a. refers to the transition of retinal sensitivity between photopic and scotopic vision b. refers to the shift in the spectral sensitivity of the human retina toward shorter wavelengths of light c. accounts for blue colour appearing brighter at dusk d. all above

Last Answer : all above

True statements about the retinal blood flow include: a. the retina receives 5% of total ocular blood flow b. the retinal blood flow is mainly under the sympathetic control c. the retina blood vessels are impermeable to ascorbate d. the pericytes control the contractile activity of the retinal blood vessels

Description : True statements about the retinal blood flow include: a. the retina receives 5% of total ocular blood flow b. the retinal blood flow is mainly under the sympathetic control c. the ... are impermeable to ascorbate d. the pericytes control the contractile activity of the retinal blood vessels

Last Answer : the pericytes control the contractile activity of the retinal blood vessels

The following are true: a. the ratio of rod to cone is about 20:1 b. there are more ganglion cells in the retina than photoreceptors c. the rod density is the highest nasal to the optic disc d. the retinal artery is the main supply of nutrients to the photoreceptors

Description : The following are true: a. the ratio of rod to cone is about 20:1 b. there are more ganglion cells in the retina than photoreceptors c. the rod density is the highest nasal to the optic disc d. the retinal artery is the main supply of nutrients to the photoreceptors

Last Answer : the ratio of rod to cone is about 20:1

Which one of the following statements is not correct? (a) Retinal is the light absorbing portion of visual photopigments. (b) In retina the rods have the photopigment rhodopsin while cones have three different photopigments. (c) Retinal is a derivative of vitamin C. (d) Rhodopsin is the purplish red protein present in rods only.

Description : Which one of the following statements is not correct? (a) Retinal is the light absorbing portion of visual photopigments. (b) In retina the rods have the photopigment rhodopsin while cones have three ... a derivative of vitamin C. (d) Rhodopsin is the purplish red protein present in rods only.

Last Answer : (c) Retinal is a derivative of vitamin C.

In Central retinal artery occlusion, a cherry red spot is due to: a. Hemorrhage at macula b. Increased choroidal perfusion c. Increase in retinal perfusion at macula d. The contrast between pale retina and reddish choroids

Description : In Central retinal artery occlusion, a cherry red spot is due to: a. Hemorrhage at macula b. Increased choroidal perfusion c. Increase in retinal perfusion at macula d. The contrast between pale retina and reddish choroids  

Last Answer : ANSWER: D

The structures that are formed by stacking of organised flattened membranous sacs in the chloroplasts are (a) stroma lamellae (b) stroma (c) cristae (d) grana.

Description : The structures that are formed by stacking of organised flattened membranous sacs in the chloroplasts are (a) stroma lamellae (b) stroma (c) cristae (d) grana.

Last Answer : (d) grana.

What are the features for Human Retinal Pigment Epithelial Cells?

Description : What are the features for Human Retinal Pigment Epithelial Cells?

Last Answer : Human Retinal Pigment Epithelial Cells (HRPEpiC) are isolatedfrom human retina. HRPEpiC are cryopreserved at passage one anddelivered frozen. Each vial contains >5 x 10^5 cells in 1 mlvolume. HRPEpiC are ... fibronectin.HRPEpiC are negative for HIV-1, HBV, HCV, mycoplasma, bacteria,yeast and fungi.

The light reflex involves the following structures: a. Edinger-Westphal nucleus b. ciliary ganglion c. lateral geniculate body d. oculomotor nerve

Description : The light reflex involves the following structures: a. Edinger-Westphal nucleus b. ciliary ganglion c. lateral geniculate body d. oculomotor nerve

Last Answer : Edinger-Westphal nucleus

In eye donation, which one of the parts of donor’s eye is utilized? A. Lens B. Retina C. Cornea D. Iris

Description : In eye donation, which one of the parts of donor’s eye is utilized? A. Lens B. Retina C. Cornea D. Iris

Last Answer : ANSWER: C

In eye donation, which one of the parts of donor’s eye is utilized? A. Lens B. Retina C. Cornea D. Iris

Description : In eye donation, which one of the parts of donor’s eye is utilized? A. Lens B. Retina C. Cornea D. Iris

Last Answer : ANSWER: C

In eye donation, which one of the parts of donor’s eye is utilized? A. Lens B. Retina C. Cornea D. Iris

Description : In eye donation, which one of the parts of donor’s eye is utilized? A. Lens B. Retina C. Cornea D. Iris

Last Answer : ANSWER: C