When a stimulus is applied on axonal membrane then generation of action potential is due to

When a stimulus is applied on axonal membrane then generation of action potential is due to
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When a stimulus is applied on axonal membrane then generation of action potential is due to
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When a stimulus is applied on axonal membrane then generation of action potential is due to

Description : When a stimulus is applied on axonal membrane then generation of action potential is due to

Last Answer : When a stimulus is applied on axonal membrane then generation of action potential is due to

The following are true about an action potential in a nerve fibre: a. it occurs when its membrane potential is hyperpolarized b. it is associated with a transient increase in membrane permeability to sodium c. there is a decreased in membrane permeability to potassium d. it has an amplitude which varies directly to the strength of stimulus

Description : The following are true about an action potential in a nerve fibre: a. it occurs when its membrane potential is hyperpolarized b. it is associated with a transient increase in membrane ... permeability to potassium d. it has an amplitude which varies directly to the strength of stimulus

Last Answer : there is a decreased in membrane permeability to potassium

In the neurone: a. the magnitude of the action potential is dependent on the strength of the stimulus b. impulses can travel in both direction c. depolarization is accompanied by increased permeability of the cell membrane to potassium ions d. during depolarization, the potential of the neurone changes from -70mV to +40mV

Description : In the neurone: a. the magnitude of the action potential is dependent on the strength of the stimulus b. impulses can travel in both direction c. depolarization is accompanied by increased ... potassium ions d. during depolarization, the potential of the neurone changes from -70mV to +40mV

Last Answer : during depolarization, the potential of the neurone changes from -70mV to +40mV

Which terminology deals with the excitation or stimulus applied to the system from an external source for the generation of an output? a. Input signal b. Output signal c. Error signal d. Feedback signal

Description : Which terminology deals with the excitation or stimulus applied to the system from an external source for the generation of an output? a. Input signal b. Output signal c. Error signal d. Feedback signal

Last Answer : Ans: A

At resting stage permeability of `K^(+)` ion is more comparatively `Na^(+)` ion through axonal membrane

Description : At resting stage permeability of `K^(+)` ion is more comparatively `Na^(+)` ion through axonal membrane

Last Answer : At resting stage permeability of `K^(+)` ion is more comparatively `Na^(+)` ion through axonal membrane

At resting stage permeability of `K^(+)` ion is more comparatively `Na^(+)` ion through axonal membrane

Description : At resting stage permeability of `K^(+)` ion is more comparatively `Na^(+)` ion through axonal membrane

Last Answer : At resting stage permeability of `K^(+)` ion is more comparatively `Na^(+)` ion through axonal membrane

Tyramine induces release of noradrenaline from adrenergic nerve endings (a) By depolarizing the axonal membrane (b) By mobilizing Ca2+ (c) By a nonexocytotic process (d) Only in the presence of MAO inhibitors

Description : Tyramine induces release of noradrenaline from adrenergic nerve endings (a) By depolarizing the axonal membrane (b) By mobilizing Ca2+ (c) By a nonexocytotic process (d) Only in the presence of MAO inhibitors

Last Answer : Ans: C

When a neuron is in resting state i.e., not conducting any impulse, the axonal membrane is (a) comparatively more permeable to Na+ ions and nearly impermeable to K+ ions (b) equally permeable to both Na+ and K+ ions (c) impermeable to both Na+ and K+ ions (d) comparatively more permeable to K+ ions and nearly impermeable to Na+ ions.

Description : When a neuron is in resting state i.e., not conducting any impulse, the axonal membrane is (a) comparatively more permeable to Na+ ions and nearly impermeable to K+ ions (b) equally permeable to both ... + and K+ ions (d) comparatively more permeable to K+ ions and nearly impermeable to Na+ ions.

Last Answer : (d) comparatively more permeable to K+ ions and nearly impermeable to Na+ ions.

Tyramine induces release of noradrenaline from adrenergic nerve endings: A. By depolarizing the axonal membrane B. By mobilizing Ca2+ C. By a nonexocytotic process D. Only in the presence of MAO inhibitors

Description : Tyramine induces release of noradrenaline from adrenergic nerve endings: A. By depolarizing the axonal membrane B. By mobilizing Ca2+ C. By a nonexocytotic process D. Only in the presence of MAO inhibitors

Last Answer : C. By a nonexocytotic process

Tyramine induces release of noradrenaline from adrenergic nerve endings: A. By depolarizing the axonal membrane B. By mobilizing Ca2+ C. By a nonexocytotic process D. Only in the presence of MAO inhibitors

Description : Tyramine induces release of noradrenaline from adrenergic nerve endings: A. By depolarizing the axonal membrane B. By mobilizing Ca2+ C. By a nonexocytotic process D. Only in the presence of MAO inhibitors

Last Answer : C. By a nonexocytotic process

Which of the following statements is not correct? (a) An action potential in an axon does not move backward because the segment behind is in a refractory phase. (b) Depolarisation of hair cells of cochlea results in the opening of the mechanically gated potassium-ion channels. (c) Rods are very sensitive and contribute to daylight vision. (d) In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction.

Description : Which of the following statements is not correct? (a) An action potential in an axon does not move backward because the segment behind is in a refractory phase. (b) Depolarisation of hair cells ... d) In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction.

Last Answer : (c) Rods are very sensitive and contribute to daylight vision.

The principal process which terminates the action of noradrenaline released from adrenergic nerve ending is: A. Degradation by MAO B. Methylation by COMT C. Axonal uptake D. Extraneuronal uptake

Description : The principal process which terminates the action of noradrenaline released from adrenergic nerve ending is: A. Degradation by MAO B. Methylation by COMT C. Axonal uptake D. Extraneuronal uptake

Last Answer : C. Axonal uptake

The principal process which terminates the action of noradrenaline released from adrenergic nerve ending is: A. Degradation by MAO B. Methylation by COMT C. Axonal uptake D. Extraneuronal uptake

Description : The principal process which terminates the action of noradrenaline released from adrenergic nerve ending is: A. Degradation by MAO B. Methylation by COMT C. Axonal uptake D. Extraneuronal uptake

Last Answer : C. Axonal uptake

What has to happen before a call membrane can respond to a second stimulus?

Description : What has to happen before a call membrane can respond to a second stimulus?

Last Answer : What is the answer ?

Cell regulation can be thought of as the effector side of cell communication. Most commonly cell regulation occurs by means of extracellular chemical messengers. Which of the following statement(s) is/are true concerning these messengers? a. Paracrine regulation involves a messenger which is produced and acts systemically b. The extracellular signal or stimulus is received by a receptor on or in the target cell c. Neurocrine regulation depends on a physical connection between the neuron and the target cell d. Most hormones, local mediators, and neurotransmitters readily cross the cell plasma membrane

Description : Cell regulation can be thought of as the effector side of cell communication. Most commonly cell regulation occurs by means of extracellular chemical messengers. Which of the following statement(s ... d. Most hormones, local mediators, and neurotransmitters readily cross the cell plasma membrane

Last Answer : Answer: b, c Depending on how the extracellular messenger arrives, cell regulation can be classified as paracrine, endocrine, or neurocrine. In paracrine regulation, a chemical messenger ... , local mediators, and neurotransmitters are water-soluble and cannot readily cross the plasma membrane

The transport of proteins out of the cell is termed exocytosis. Which of the following statement(s) is/are true concerning this process? a. Secretory vesicles fuse with the plasma membrane b. The process can occur in either a constitutive or regulated process c. A regulated secretion is triggered by a stimulus, most likely a hormone or a neurotransmitter d. A decrease in cytoplasmic calcium occurs as part of the secretion process

Description : The transport of proteins out of the cell is termed exocytosis. Which of the following statement(s) is/are true concerning this process? a. Secretory vesicles fuse with the plasma membrane b. ... or a neurotransmitter d. A decrease in cytoplasmic calcium occurs as part of the secretion process

Last Answer : Answer: a, b, c Transport vesicles that bud off the Golgi network carry both material to be secreted from the cell and protein destined to become components of the plasma ... but may also involve generation of diacylglycerol or production of cyclic AMP which activate kinases or phosphatases

The action potential of a neuron a. is initiated by efflux of Na+ b. is terminated by efflux of K+ c. declines in amplitude as it moves along the axon d. results in a transient reversal of the concentration gradient of Na+ across the cell membrane e. is not associated with any net movement of Na+ or K+ across the cell membrane

Description : The action potential of a neuron a. is initiated by efflux of Na+ b. is terminated by efflux of K+ c. declines in amplitude as it moves along the axon d. results in a transient reversal of the ... the cell membrane e. is not associated with any net movement of Na+ or K+ across the cell membrane

Last Answer : is terminated by efflux of K+

The following processes depend on changes in membrane conductance to Na and K. a. Action potential b. depolarization c. repolarization d. all of them

Description : The following processes depend on changes in membrane conductance to Na and K. a. Action potential b. depolarization c. repolarization d. all of them

Last Answer : all of them

The most significant feature of the antiarrhythmic action of lignocaine is: A. Suppression of phase-4 depolarization in ventricular ectopic foci B. Prolongation of action potential duration C. Prolongation of effective refractory period D. Depression of membrane responsiveness

Description : The most significant feature of the antiarrhythmic action of lignocaine is: A. Suppression of phase-4 depolarization in ventricular ectopic foci B. Prolongation of action potential duration C. Prolongation of effective refractory period D. Depression of membrane responsiveness

Last Answer : A. Suppression of phase-4 depolarization in ventricular ectopic foci

The electrophysiological effects of digitalis on Purkinje fibres include the following except: A. Enhancement of resting membrane potential B. Decrease in the slope of phase-0 depolarization C. Increase in the rate of phase-4 depolarization D. Abbreviation of action potential duration

Description : The electrophysiological effects of digitalis on Purkinje fibres include the following except: A. Enhancement of resting membrane potential B. Decrease in the slope of phase-0 depolarization C. Increase in the rate of phase-4 depolarization D. Abbreviation of action potential duration

Last Answer : A. Enhancement of resting membrane potential

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 

What is the role of Na+ in the generation of action potential? -Biology

Description : What is the role of Na+ in the generation of action potential? -Biology

Last Answer : answer:

Generation of action potential concern with which layer of retina

Description : Generation of action potential concern with which layer of retina

Last Answer : Generation of action potential concern with which layer of retina

Generation of action potential in stage of

Description : Generation of action potential in stage of

Last Answer : Generation of action potential in stage of

Generation of action potential concern with which layer of retina

Description : Generation of action potential concern with which layer of retina

Last Answer : Generation of action potential concern with which layer of retina

Generation of action potential in stage of

Description : Generation of action potential in stage of

Last Answer : Generation of action potential in stage of

Dantrolene sodium reduces skeletal muscle tone by: A. Reducing acetylcholine release from motor nerve endings B. Suppressing spinal polysynaptic reflexes C. Inhibiting the generation of muscle action potential D. Reducing Ca2+ release from sarcoplasmic reticulum in the muscle fibre

Description : Dantrolene sodium reduces skeletal muscle tone by: A. Reducing acetylcholine release from motor nerve endings B. Suppressing spinal polysynaptic reflexes C. Inhibiting the generation of muscle action potential D. Reducing Ca2+ release from sarcoplasmic reticulum in the muscle fibre

Last Answer : D. Reducing Ca2+ release from sarcoplasmic reticulum in the muscle fibre

The second generation H1 antihistaminics have the following advantages except: A. Lack of anticholinergic side effects B. Lack of alcohol potentiating potential C. Recipient can drive motor vehicles D. Good antipruritic action

Description : The second generation H1 antihistaminics have the following advantages except: A. Lack of anticholinergic side effects B. Lack of alcohol potentiating potential C. Recipient can drive motor vehicles D. Good antipruritic action

Last Answer : D. Good antipruritic action

The path through which a stimulus passes in a reflex action?

Description : The path through which a stimulus passes in a reflex action?

Last Answer : Reflex arc

Phenylephrine (a) Mimics the transmitter at post-synaptic receptors (b) Displaces transmitter from axonal terminal (c) Inhibits synthesis of transmitter (d) None of the above

Description : Phenylephrine (a) Mimics the transmitter at post-synaptic receptors (b) Displaces transmitter from axonal terminal (c) Inhibits synthesis of transmitter (d) None of the above

Last Answer : Ans: A

Guanethidine inhibits (a) Synthesis of transmitter (b) Metabolism of transmitter (c) Release of transmitter (d) Displacement of transmitter from axonal terminal

Description : Guanethidine inhibits (a) Synthesis of transmitter (b) Metabolism of transmitter (c) Release of transmitter (d) Displacement of transmitter from axonal terminal

Last Answer : Ans: C

The following type/types of noradrenaline uptake is blocked by reserpine: A. Axonal uptake B. Granular uptake C. Extraneuronal uptake D. All of the above

Description : The following type/types of noradrenaline uptake is blocked by reserpine: A. Axonal uptake B. Granular uptake C. Extraneuronal uptake D. All of the above

Last Answer : B. Granular uptake

The following type/types of noradrenaline uptake is blocked by reserpine: A. Axonal uptake B. Granular uptake C. Extraneuronal uptake D. All of the above

Description : The following type/types of noradrenaline uptake is blocked by reserpine: A. Axonal uptake B. Granular uptake C. Extraneuronal uptake D. All of the above

Last Answer : B. Granular uptake

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge? (a) First positive, then negative and continue to be negative (b) First negative, then positive and continue to be positive (c) First positive, then negative and again back to positive (d) First negative, then positive and again back to negative.

Description : During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge? (a) First positive, then negative and continue ... and again back to positive (d) First negative, then positive and again back to negative.

Last Answer : (d) First negative, then positive and again back to negative.

Bactericidal action of aminoglycoside antibiotics is due to: A. Inhibition of bacterial protein synthesis B. Alteration of bacterial cell membrane permeability C. Damage to bacterial cell wall D. Inhibition of bacterial oxidative metabolism

Description : Bactericidal action of aminoglycoside antibiotics is due to: A. Inhibition of bacterial protein synthesis B. Alteration of bacterial cell membrane permeability C. Damage to bacterial cell wall D. Inhibition of bacterial oxidative metabolism

Last Answer : B. Alteration of bacterial cell membrane permeability

Anthelmintic action of piperazine is due to: A. Interference with ATP generation in the worm B. Blockade of glucose uptake by the worm C. Hyperpolarization of nematode muscle by GABA agonistic action D. Depolarization of nematode muscle by activating nicotinic receptors

Description : Anthelmintic action of piperazine is due to: A. Interference with ATP generation in the worm B. Blockade of glucose uptake by the worm C. Hyperpolarization of nematode muscle by GABA agonistic action D. Depolarization of nematode muscle by activating nicotinic receptors

Last Answer : C. Hyperpolarization of nematode muscle by GABA agonistic action

The electron transport chain within the inner mitochondrial membrane creates a gradient of ____________ across the inner membrane which is utilized to drive the activity of ATP synthase and the generation of ATP.

Description : The electron transport chain within the inner mitochondrial membrane creates a gradient of ____________ across the inner membrane which is utilized to drive the activity of ATP synthase and the generation of ATP.

Last Answer : Hydrogen (H+ ions) or protons

Actions of 5-HT2 receptor activation are primarily mediated by: A. Increased membrane permeability to Na+ ions B. Increased formation of cAMP C. Activation of guanylyl cyclase D. Generation of inositol trisphosphate and diacyl glycerols

Description : Actions of 5-HT2 receptor activation are primarily mediated by: A. Increased membrane permeability to Na+ ions B. Increased formation of cAMP C. Activation of guanylyl cyclase D. Generation of inositol trisphosphate and diacyl glycerols

Last Answer : D. Generation of inositol trisphosphate and diacyl glycerols

Air gap readings should be taken periodicly on electrical generation equipment to __________. A. determine the amount of varnish that can be applied to correct insulation problems B. determine the condition of the bearings C. provide for the correct proper tightening of the field coil bolts and correct lateral adjustment of the field coils D. increase machine efficiency

Description : Air gap readings should be taken periodicly on electrical generation equipment to __________. A. determine the amount of varnish that can be applied to correct insulation problems B. determine the ... field coil bolts and correct lateral adjustment of the field coils D. increase machine efficiency

Last Answer : Answer: B

Dorzolamide is a: A. Topically applied ocular carbonic anhydrase inhibitor B. Second generation sulfonylurea hypoglycaemic C. Topical sulfonamide antibacterial D. Luminal amoebicide

Description : Dorzolamide is a: A. Topically applied ocular carbonic anhydrase inhibitor B. Second generation sulfonylurea hypoglycaemic C. Topical sulfonamide antibacterial D. Luminal amoebicide

Last Answer : A. Topically applied ocular carbonic anhydrase inhibitor

Dorzolamide is a: A. Topically applied ocular carbonic anhydrase inhibitor B. Second generation sulfonylurea hypoglycaemic C. Topical sulfonamide antibacterial D. Luminal amoebicide

Description : Dorzolamide is a: A. Topically applied ocular carbonic anhydrase inhibitor B. Second generation sulfonylurea hypoglycaemic C. Topical sulfonamide antibacterial D. Luminal amoebicide

Last Answer : A. Topically applied ocular carbonic anhydrase inhibitor

The potential difference across the membrane of a relaxed muscle fiber is called resting potential. It amounts to about

Description : The potential difference across the membrane of a relaxed muscle fiber is called resting potential. It amounts to about

Last Answer : The potential difference across the membrane of a relaxed muscle fiber is called resting potential. It amounts to ... C. `100m V` D. `50- 100mV`

The resting membrane potential of a cell a. is dependent on the permeability of the cell membrane to K+ being greater than the permeability to Na+ b. falls to zero immediately when Na+, K+ ATPase in the membrane is inhibited c. is usually equal to the equilibrium potential for K+ d. is usually equal to the equilibrium potential for Na+ e. is markedly altered if the extracellular Na+ concentration is increased

Description : The resting membrane potential of a cell a. is dependent on the permeability of the cell membrane to K+ being greater than the permeability to Na+ b. falls to zero immediately when Na+ ... the equilibrium potential for Na+ e. is markedly altered if the extracellular Na+ concentration is increased

Last Answer : is dependent on the permeability of the cell membrane to K+ being greater than the permeability to Na+

Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on (a) membrane potential (b) accumulation of Na+ ions (c) accumulation of K+ ions (d) proton gradient.

Description : Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on (a) membrane potential (b) accumulation of Na+ ions (c) accumulation of K+ ions (d) proton gradient.

Last Answer : (d) proton gradient

Fees paid by advertisers to online company that refer qualified potential customers or provide consumer information where the consumer opts in to being contacted by a marketer. This is referred to as: 1. Lead generation 2. Search 3. Rich media 4. Social media marketing

Description : Fees paid by advertisers to online company that refer qualified potential customers or provide consumer information where the consumer opts in to being contacted by a marketer. This is referred to as: 1. Lead generation 2. Search 3. Rich media 4. Social media marketing

Last Answer : Lead generation

The power generation potential in mini hydro power plant for a water flow of 3 m3 /sec with a head of 14 meters and with a system efficiency of 55% is a) 226.6 kW b) 76.4 kW c) 23.1 kW d) none of the above

Description : The power generation potential in mini hydro power plant for a water flow of 3 m3 /sec with a head of 14 meters and with a system efficiency of 55% is a) 226.6 kW b) 76.4 kW c) 23.1 kW d) none of the above

Last Answer : a) 226.6 kW

A potential difference of V = 100 ± 2 volt, when applied across a resistance R gives a current of 10 ± 0.5 ampere.

Description : A potential difference of V = 100 ± 2 volt, when applied across a resistance R gives a current of 10 ± 0.5 ampere.

Last Answer : A potential difference of V = 100 2 volt, when applied across a resistance R gives a current of 10 ... percentage error in R given by R = V/I.