During contraction and relaxation of striated muscle fibre the length of A band usually :-

During contraction and relaxation of striated muscle fibre the length of A band usually :-
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During contraction and relaxation of striated muscle fibre the length of A band usually :- A. ... . Increases C. Decreases D. Decreases too much
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(CBSE 2011): Aditi observed following observations while looking into a permanent slide. (i) Cells are long and cylindrical (ii) Light and dark bands are present. It could be a slide of : (a) striated muscle fibre (b) smooth muscle fibre (c) neuron (d) parenchyma cells

Description : (CBSE 2011): Aditi observed following observations while looking into a permanent slide. (i) Cells are long and cylindrical (ii) Light and dark bands are present. It could be a slide of : (a) striated muscle fibre (b) smooth muscle fibre (c) neuron (d) parenchyma cells

Last Answer : (a) striated muscle fibre

The following are true about the smooth muscle cells: a. presence of a striated appearance b. do not contain actin and myosin c. spontaneous muscle contraction d. mitochondria are absent

Description : The following are true about the smooth muscle cells: a. presence of a striated appearance b. do not contain actin and myosin c. spontaneous muscle contraction d. mitochondria are absent

Last Answer : spontaneous muscle contraction

The following are true about the smooth muscle cells: a. presence of a striated appearance b. do not contain actin and myosin c. spontaneous muscle contraction d. mitochondria are absent

Description : The following are true about the smooth muscle cells: a. presence of a striated appearance b. do not contain actin and myosin c. spontaneous muscle contraction d. mitochondria are absent

Last Answer : spontaneous muscle contraction

The following are true: a. Kirschman's law: the greatest contrast in colour is seen when the luminosity differnece is small b. Emmbert's law: the perceived size of an object varies in proportion to the distance of the surface on which it is projected c. Hering's law: the contraction of a muscle is accompanied by simultaneous and proportional relaxation of the antagonist d. Troxler's phenomenon: an image in the periphery of the retina tends to fade or disappear during steady fixation of another objec

Description : The following are true: a. Kirschman's law: the greatest contrast in colour is seen when the luminosity differnece is small b. Emmbert's law: the perceived size of an object varies in ... image in the periphery of the retina tends to fade or disappear during steady fixation of another objec

Last Answer : Troxler's phenomenon: an image in the periphery of the retina tends to fade or disappear during steady fixation of another objec

Assertion : The contraction and relaxation of muscle fiber are controlled by nerve impulses. Reason : The threshold stimulus is the minimum stimulus r

Description : Assertion : The contraction and relaxation of muscle fiber are controlled by nerve impulses. Reason : The threshold stimulus is the minimum stimulus r

Last Answer : Assertion : The contraction and relaxation of muscle fiber are controlled by nerve impulses. Reason : ... D. If both Assertion and Reason are false.

The effects of topically applied anticholinesterase on the eye include: a. conjunctival hyperaemia b. raised intraocular pressure c. ciliary muscle contraction d. sphincter pupillae muscle relaxation e. retraction of the upper lids

Description : The effects of topically applied anticholinesterase on the eye include: a. conjunctival hyperaemia b. raised intraocular pressure c. ciliary muscle contraction d. sphincter pupillae muscle relaxation e. retraction of the upper lids

Last Answer : ciliary muscle contraction

Lack of relaxation between successive stimuli in sustained muscle contraction is known as (a) tetanus (b) tonus (c) spasm (d) fatigue.

Description : Lack of relaxation between successive stimuli in sustained muscle contraction is known as (a) tetanus (b) tonus (c) spasm (d) fatigue.

Last Answer : (a) tetanus

Which one of the following describes the mode of action of tetanospasmin? a. It inhibits muscle contraction. b. It damages and lyses red blood cells. c. It disrupts cell tissues. d. It inhibits muscle relaxation.

Description : Which one of the following describes the mode of action of tetanospasmin? a. It inhibits muscle contraction. b. It damages and lyses red blood cells. c. It disrupts cell tissues. d. It inhibits muscle relaxation.

Last Answer : d. It inhibits muscle relaxation.

The functional unit of contractile system in striated muscle is (a) sarcomere (b) Z-band (c) cross bridges (d) myofibril.

Description : The functional unit of contractile system in striated muscle is (a) sarcomere (b) Z-band (c) cross bridges (d) myofibril.

Last Answer : (a) sarcomere

Which statement is correct for muscle contraction? (a) Length of H-zone decreases. (b) Length of A-band remains constant. (c) Length of I-band increases. (d) Length of two Z-line increases.

Description : Which statement is correct for muscle contraction? (a) Length of H-zone decreases. (b) Length of A-band remains constant. (c) Length of I-band increases. (d) Length of two Z-line increases.

Last Answer : (b) Length of A-band remains constant.

One of the following statements about muscular responses is not true. Choose that one (a) A muscle fibre contracts in all-or-none fashion (b) There is a slight latent period that occurs between when the stimulus arrives at the muscle and when a muscle contracts. (c) Muscles will add motor units to a contraction, increasing the overall force of contraction (d) When a person is fully at rest, none of the muscles are contracting in the body

Description : One of the following statements about muscular responses is not true. Choose that one (a) A muscle fibre contracts in all-or-none fashion (b) There is a slight latent period that occurs between when ... contraction (d) When a person is fully at rest, none of the muscles are contracting in the body

Last Answer : Ans:(d)

During muscle contraction in humans, the (a) sarcomere does not shorten (b) A band remains same (c) A, H and I bands shorten (d) actin filaments shorten.

Description : During muscle contraction in humans, the (a) sarcomere does not shorten (b) A band remains same (c) A, H and I bands shorten (d) actin filaments shorten.

Last Answer : (b) A band remains same

During inspiration, the diaphragm moves: a) down by contraction b) down by relaxation c) up by contraction d) up by relaxation

Description : During inspiration, the diaphragm moves: a) down by contraction b) down by relaxation c) up by contraction d) up by relaxation

Last Answer : ANSWER: A -- DOWN BY CONTRACTION 

The H-disk in the skeletal muscle fibre is due to (a) the absence of myofibrils in the central portion of Aband (b) the central gap between myosin filaments in the Aband Questions (c) the central gap between actin filaments extending through myosin filaments in the A-band (d) birefringence of myosin filaments in the central portion of A-band

Description : The H-disk in the skeletal muscle fibre is due to (a) the absence of myofibrils in the central portion of Aband (b) the central gap between myosin filaments in the Aband Questions (c) the ... myosin filaments in the A-band (d) birefringence of myosin filaments in the central portion of A-band

Last Answer : Ans:(c)

The H-zone in the skeletal muscle fibre is due to (a) the central gap between actin filaments extending through myosin filaments in the A-band (b) extension of myosin filaments in the central portion of the A-band (c) the absence of myofibrils in the central portion of A-band (d) the central gap between myosin filaments in the A-band.

Description : The H-zone in the skeletal muscle fibre is due to (a) the central gap between actin filaments extending through myosin filaments in the A-band (b) extension of myosin filaments in the central portion ... the central portion of A-band (d) the central gap between myosin filaments in the A-band.

Last Answer : (a) the central gap between actin filaments extending through myosin filaments in the A-band

Which cells are responsible for contraction and relaxation movements? -Biology 9th

Description : Which cells are responsible for contraction and relaxation movements? -Biology 9th

Last Answer : answer:

Inhibition of the Edinger-Westphal nucleus: a. causes relaxation of the iris sphincter b. causes contraction of the iris dilator c. occurs in deep sleep d. occurs with narcotics

Description : Inhibition of the Edinger-Westphal nucleus: a. causes relaxation of the iris sphincter b. causes contraction of the iris dilator c. occurs in deep sleep d. occurs with narcotics

Last Answer : causes contraction of the iris dilator

Which of the following DOES NOT cause depression of the mandible: A. Contraction of lateral pterygoid B. Contraction of temporalis C. Contraction of the suprahyoid muscles D. Contraction of the infrahyoid muscles E. Relaxation of all muscles so that the only forces on the mandible are the forces of

Description : Which of the following DOES NOT cause depression of the mandible: A. Contraction of lateral pterygoid B. Contraction of temporalis C. Contraction of the suprahyoid muscles D. Contraction of the ... E. Relaxation of all muscles so that the only forces on the mandible are the forces of

Last Answer : B. Contraction of temporalis

When the potential difference across a membrane of a neuron equals the threshold, what results? a) movement of the membrane b) action potential c) relaxation d) contraction

Description : When the potential difference across a membrane of a neuron equals the threshold, what results? a) movement of the membrane b) action potential c) relaxation d) contraction

Last Answer : ANSWER: B -- ACTION POTENTIAL 

Which of the following statements about the striated muscles is ture ? In the centre of each I-Band is an elastic fiber(Z-line ) which bisects it M-li

Description : Which of the following statements about the striated muscles is ture ? In the centre of each I-Band is an elastic fiber(Z-line ) which bisects it M-li

Last Answer : Which of the following statements about the striated muscles is ture ? In the centre of each I-Band is an elastic ... C. `i and iii` D. `i and ii`

List any two differences between striated and cardiac muscle with respect to their structure and location. -Biology 9th

Description : List any two differences between striated and cardiac muscle with respect to their structure and location. -Biology 9th

Last Answer : Difference between striated, unstriated and cardiac muscles Striated muscles Unstriated muscles Cardiac musclesStructure Also known as skeletal muscles, they are striated, tubular, multinucleated, unbranched and tubular ... are found in walls of internal organs.They are found in walls of heart.

Bundles of striated muscle fibres called fasciculi are surrounded by a sheath called :-

Description : Bundles of striated muscle fibres called fasciculi are surrounded by a sheath called :-

Last Answer : Bundles of striated muscle fibres called fasciculi are surrounded by a sheath called :- A. Epimysium B. Perimysium C. Exomysium D. Endomysium

The hydrolysis of Glucose-6-phosphate is catalysed by a specific phosphatase which is found only in (A) Liver, intestines and kidneys (B) Brain, spleen and adrenals (C) Striated muscle (D) Plasma

Description : The hydrolysis of Glucose-6-phosphate is catalysed by a specific phosphatase which is found only in (A) Liver, intestines and kidneys (B) Brain, spleen and adrenals (C) Striated muscle (D) Plasma

Last Answer : A

The type of muscle present in our (a) heart is involuntary and unstriated smooth muscle (b) intestine is striated and involuntary (c) thigh is striated and voluntary (d) upper arm is smooth muscle and fusiform in shape.

Description : The type of muscle present in our (a) heart is involuntary and unstriated smooth muscle (b) intestine is striated and involuntary (c) thigh is striated and voluntary (d) upper arm is smooth muscle and fusiform in shape.

Last Answer : (c) thigh is striated and voluntary

Characteristics of smooth muscle fibres are (a) spindle-shaped, unbranched, nonstriated, uninucleate and involuntary (b) spindle-shaped, unbranched, unstriped, multinucleate and involuntary (c) cylindrical, unbranched, unstriped, multinucleate and involuntary (d) cylindrical, unbranched, striated, multinucleate and voluntary.

Description : Characteristics of smooth muscle fibres are (a) spindle-shaped, unbranched, nonstriated, uninucleate and involuntary (b) spindle-shaped, unbranched, unstriped, multinucleate and involuntary (c ... , multinucleate and involuntary (d) cylindrical, unbranched, striated, multinucleate and voluntary.

Last Answer : (a) spindle-shaped, unbranched, nonstriated, uninucleate and involuntary

Which one of the following contains the largest quantity of extracellular material? (a) Striated muscle (b) Areolar tissue (c) Stratified epithelium (d) Myelinated nerve fibres

Description : Which one of the following contains the largest quantity of extracellular material? (a) Striated muscle (b) Areolar tissue (c) Stratified epithelium (d) Myelinated nerve fibres

Last Answer : (b) Areolar tissue

Which of the following is an example of striated tissue? a) muscle b) nervous c) epithelial (pron: ep-a-THEE-lee-al) d) connective

Description : Which of the following is an example of striated tissue? a) muscle b) nervous c) epithelial (pron: ep-a-THEE-lee-al) d) connective

Last Answer : ANSWER: A -- MUSCLE

The muscle which is under involuntary control is: a) striated b) smooth c) skeletal

Description : The muscle which is under involuntary control is: a) striated b) smooth c) skeletal

Last Answer : ANSWER: B -- SMOOTH

Why can cardiac muscle fibres contract for longer periods than skeletal fibres? (a) Cardiac muscle is self-excitatory (b) Extracellular calcium partially controls the strength (and length) of contraction (c) Cisternae of T-tubules are more developed in cardiac muscle (d) Cardiac muscle is uninucleate rather than multinucleate

Description : Why can cardiac muscle fibres contract for longer periods than skeletal fibres? (a) Cardiac muscle is self-excitatory (b) Extracellular calcium partially controls the strength (and length) ... tubules are more developed in cardiac muscle (d) Cardiac muscle is uninucleate rather than multinucleate

Last Answer : Ans:(a)

Which of the following terms refers to muscle tension being unchanged with muscle shortening and joint motion? a) Isotonic contraction Exercises such as swimming and bicycling are isotonic. b) Isometric contraction Isometric contraction is characterized by increased muscle tension, unchanged muscle length, and no joint motion. c) Contracture Contracture refers to abnormal shortening of muscle, joint, or both. d) Fasciculation Fasciculation refers to involuntary twitch of muscle fibers.

Description : Which of the following terms refers to muscle tension being unchanged with muscle shortening and joint motion? a) Isotonic contraction Exercises such as swimming and bicycling are isotonic. b) ... , joint, or both. d) Fasciculation Fasciculation refers to involuntary twitch of muscle fibers.

Last Answer : a) Isotonic contraction Exercises such as swimming and bicycling are isotonic.

Where can you find the best sauna baths for muscle relaxation?

Description : Where can you find the best sauna baths for muscle relaxation?

Last Answer : The best sauna baths for muscle relaxation will depend on what location you are living in. Typically the best location for finding these is at day spas. I would look into an infrared sauna. Do your research as they all kind of look the same online. A good place to start is www.saunabuyersguide.info

Cromolyn has as its major action (a) Block of calcium channels in lymphocytes (b) Block of mediator release from mast cells (c) Block of phosphodiesterase in mast cells and basophils (d) Smooth muscle relaxation in the bronchi (e) Stimulation of cortisol release by the adrenals

Description : Cromolyn has as its major action (a) Block of calcium channels in lymphocytes (b) Block of mediator release from mast cells (c) Block of phosphodiesterase in mast cells and basophils (d) Smooth muscle relaxation in the bronchi (e) Stimulation of cortisol release by the adrenals

Last Answer : Ans: B

Which of the following effects of epinephrine would be blocked by phentolamine but not by metoprolol ? (a) Cardiac stimulation (b) Contractionof radial smooth muscle in the iris (c) Increase of camp in fat (d) Relaxation of bronchial smooth muscle (e) Relaxation of the uterus

Description : Which of the following effects of epinephrine would be blocked by phentolamine but not by metoprolol ? (a) Cardiac stimulation (b) Contractionof radial smooth muscle in the iris (c) Increase of camp in fat (d) Relaxation of bronchial smooth muscle (e) Relaxation of the uterus

Last Answer : Ans: B

Smooth muscle relaxation is due to stimulation of which type of histamine receptors (a) H1 (b) H2 (c) H3 (d) All of the above

Description : Smooth muscle relaxation is due to stimulation of which type of histamine receptors (a) H1 (b) H2 (c) H3 (d) All of the above

Last Answer : Ans: B

Leukotrienes: 1) Are formed from the cyclooxygenase pathway 2) Are synthesized by fibroblasts 3) Decrease vascular permeability 4) Leukotriene D4 has been identified as SRS-A which causes bronchial wall smooth muscle relaxation 5) Stimulate mucus secretion

Description : Leukotrienes: 1) Are formed from the cyclooxygenase pathway 2) Are synthesized by fibroblasts 3) Decrease vascular permeability 4) Leukotriene D4 has been identified as SRS-A which causes bronchial wall smooth muscle relaxation 5) Stimulate mucus secretion

Last Answer : Answers-5 Leukotrienes are synthesized by leucocytes.They are mediators of allergic reaction. They increase vascular permeability and attract neutrophils and eosinophils to inflammatory sites. ... stimulate mucus production, an important consideration in the pathophysiology of bronchial asthma.

Fentanyl transdermal patches have been used postoperatively to provide transdermal analgesia. The most dangerous adverse effect of this mode of administration is (a) Cutaneous reactions (b) Diarrhea (c) Hypertension (d) Relaxation of skeletal muscle (e) Respiratory depression

Description : Fentanyl transdermal patches have been used postoperatively to provide transdermal analgesia. The most dangerous adverse effect of this mode of administration is (a) Cutaneous reactions (b) Diarrhea (c) Hypertension (d) Relaxation of skeletal muscle (e) Respiratory depression

Last Answer : Ans: E

The relaxation techniques of progressive muscle relaxation, relaxation with guided imagery, and the Benson Relaxation Response share which of the following elements? a) A mental device (something on which to focus the attention) Similar elements also include a quiet environment, a comfortable position, and a passive attitude. b) Nutritional foundation Relaxation techniques do not encompass specific nutritional guidelines. c) Analgesic preparation Relaxation techniques are used to reduce one’s response to stress and do not require analgesia prior to practicing the techniques. d) Physician’s order A physician’s order is not required to assist an individual to learn techniques to reduce one’s response to stress.

Description : The relaxation techniques of progressive muscle relaxation, relaxation with guided imagery, and the Benson Relaxation Response share which of the following elements? a) A mental device (something on which ... required to assist an individual to learn techniques to reduce one's response to stress.

Last Answer : a) A mental device (something on which to focus the attention) Similar elements also include a quiet environment, a comfortable position, and a passive attitude.

The anaesthetic action of thiopentone sodium is characterised by: A. Good muscle relaxation B. Poor analgesia C. Sensitization of heart to adrenaline D. No postoperative residual CNS depression

Description : The anaesthetic action of thiopentone sodium is characterised by: A. Good muscle relaxation B. Poor analgesia C. Sensitization of heart to adrenaline D. No postoperative residual CNS depression

Last Answer : B. Poor analgesia

What are some things you guys do for relaxation that usually stresses people out?

Description : What are some things you guys do for relaxation that usually stresses people out?

Last Answer : Something weird I used to do when I was around 14/15 was sleep out in the living room on the couch while blasting Alice In Chains on a stereo. No this wasn't in the 90s, I didn't get introduced to them until about 2006.

What are some things you guys do for relaxation that usually stresses people out?

Description : What are some things you guys do for relaxation that usually stresses people out?

Last Answer : Something weird I used to do when I was around 14/15 was sleep out in the living room on the couch while blasting Alice In Chains on a stereo. No this wasn't in the 90s, I didn't get introduced to them until about 2006.

During muscle contraction (a)____ energy is converted into (b)____ energy

Description : During muscle contraction (a)____ energy is converted into (b)____ energy

Last Answer : During muscle contraction (a)____ energy is converted into (b)____ energy

The main source of energy during muscle contraction is____

Description : The main source of energy during muscle contraction is____

Last Answer : The main source of energy during muscle contraction is____

The lactic acid generated during muscle contraction us flnally converted to glycogen in

Description : The lactic acid generated during muscle contraction us flnally converted to glycogen in

Last Answer : The lactic acid generated during muscle contraction us flnally converted to glycogen in A. Muscle B. Kidney C. Liver D. Pancreas

Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction. (a) Calcium (b) Magnesium (c) Sodium (d) Potassium

Description : Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction. (a) Calcium (b) Magnesium (c) Sodium (d) Potassium

Last Answer : (a) Calcium

if you suspect atrial flutter : Consider digoxin if not already in use because it frequently increases the conduction ratio and decreases the ventricular rate. , Avoid adrenergic and atropinic agents during sedation or anesthesia for cardioversion. Ketamine is relatively contraindicatedthe cause of premature ventricular contraction? decrease O2 supply to the muscle decrease blood supply to the muscle the heart trying to beat fast ______________________________

Description : if you suspect atrial flutter : Consider digoxin if not already in use because it frequently increases the conduction ratio and decreases the ventricular rate. , Avoid adrenergic and ... to the muscle decrease blood supply to the muscle the heart trying to beat fast ______________________________

Last Answer : decrease O2 supply to the muscle

Depolarizing neuromuscular blockers differ from competitive blockers in the following attributes except: A. They induce contraction of isolated frog rectus abdominis muscle B. Ether anaesthesia intensifies block produced by them C. Tetanic nerve stimulation during partial depolarizing block produces well sustained contraction D. Neostigmine does not reverse block produced by them

Description : Depolarizing neuromuscular blockers differ from competitive blockers in the following attributes except: A. They induce contraction of isolated frog rectus abdominis muscle B. Ether anaesthesia ... produces well sustained contraction D. Neostigmine does not reverse block produced by them

Last Answer : B. Ether anaesthesia intensifies block produced by them

Which of the following structures or regions is incorrectly paired with its functions? (a) Medulla : Controls respiration oblongata and cardiovascular reflexes (b) Limbic : Consists of fibre tracts system that interconnect different regions of brain controls movement (c) Hypothalamus : Production of releasing hormones and regulation of temperature, hunger and thirst (d) Corpus callosum : Band of fibers connecting left and right cerebral hemispheres

Description : Which of the following structures or regions is incorrectly paired with its functions? (a) Medulla : Controls respiration oblongata and cardiovascular reflexes (b) Limbic : Consists of fibre tracts ... thirst (d) Corpus callosum : Band of fibers connecting left and right cerebral hemispheres

Last Answer : (b) Limbic : Consists of fibre tracts system that interconnect different regions of brain controls movement

Which of the following structures or regions is incorrectly paired with its function ? (1) Medulla oblongata : controls respiration and cardiovascular reflexes. (2) Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement. (3) Hypothalamus : production of releasing hormones and regulation of temperature, hunger and thirst. (4) Corpus callosum : band of fibers connecting left and right cerebral hemispheres.

Description : Which of the following structures or regions is incorrectly paired with its function ? (1) Medulla oblongata : controls respiration and cardiovascular reflexes. (2) Limbic system : consists of fibre ... and thirst. (4) Corpus callosum : band of fibers connecting left and right cerebral hemispheres.

Last Answer : (2) Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement.

The inner surface of the membrance surrounding a muscle fibre is :-

Description : The inner surface of the membrance surrounding a muscle fibre is :-

Last Answer : The inner surface of the membrance surrounding a muscle fibre is :- A. Negatively charged B. Positively charged C ... D. A storage depot of `Ca^(++)`