What is the difference between impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre? -Biology

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What is the difference between impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre? -Biology

asked Feb 2, 2022 by anonymous

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answered Feb 2, 2022 by anonymous

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Consider the following statements: 1. Propagation of a nerve impulse in a myelinated nerve fibre is different from that of unmyelinated fibre. 2. The impulse actually travels by leaping through the nodes of Ranvier in an unmyelinated fibre 3. The local circuits occur only at the internodes and at each node, the action potential is boosted to the same height by ionic mechanisms. 4. In the rest of the internodes, such an exchange is not possible due to the presence of myelin sheath acting as an insulator. Which of the above statements are incorrect? (a) 1, 2 (b) 1, 3, 4 (c) 2 only (d) 2, 3

Description : Consider the following statements: 1. Propagation of a nerve impulse in a myelinated nerve fibre is different from that of unmyelinated fibre. 2. The impulse actually travels by leaping through the nodes of Ranvier in an unmyelinated fibre 3. ... incorrect? (a) 1, 2 (b) 1, 3, 4 (c) 2 only (d) 2, 3

Last Answer : Ans:(d)

Myelinated and unmyelinated nerve fibres are found in PNS respectively are

Description : Myelinated and unmyelinated nerve fibres are found in PNS respectively are

Last Answer : Myelinated and unmyelinated nerve fibres are found in PNS respectively are

Myelinated and unmyelinated nerve fibres are found in PNS respectively are

Description : Myelinated and unmyelinated nerve fibres are found in PNS respectively are

Last Answer : Myelinated and unmyelinated nerve fibres are found in PNS respectively are

Sensitivity of a nerve fibre to blockade by lignocaine depends on: A. Whether the fibre is sensory or motor B. Whether the fibre is myelinated or nonmyelinated C. Internodal distances in the fibre D. Both ‘B’ and ‘C’ are correct

Description : Sensitivity of a nerve fibre to blockade by lignocaine depends on: A. Whether the fibre is sensory or motor B. Whether the fibre is myelinated or nonmyelinated C. Internodal distances in the fibre D. Both ‘B’ and ‘C’ are correct

Last Answer : D. Both ‘B’ and ‘C’ are correct

The following are true about the autonomic nervous system: a. the preganglionic fibres are mainly myelinated, slow conducting B fibres b. the postganglionic fibres are mainly unmyelinated C fibres c. all preganglionic neurones are cholinergic neurons d. all above

Description : The following are true about the autonomic nervous system: a. the preganglionic fibres are mainly myelinated, slow conducting B fibres b. the postganglionic fibres are mainly unmyelinated C fibres c. all preganglionic neurones are cholinergic neurons d. all above

Last Answer : all above

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.

The pain sensation a. arises from stimulation of free nerve endings b. is transmitted to the central nervous system by unmyelinated C fibres c. is transmitted to the brain via the spinothalamic tracts d. all above

Description : The pain sensation a. arises from stimulation of free nerve endings b. is transmitted to the central nervous system by unmyelinated C fibres c. is transmitted to the brain via the spinothalamic tracts d. all above

Last Answer : all above

The pain sensation a. arises from stimulation of free nerve endings b. is transmitted to the central nervous system by unmyelinated C fibres c. is transmitted to the brain via the spinothalamic tracts d. is reduced by local anaesthetics through reduction of the potassium influx into the nerve fibres

Description : The pain sensation a. arises from stimulation of free nerve endings b. is transmitted to the central nervous system by unmyelinated C fibres c. is transmitted to the brain via the ... d. is reduced by local anaesthetics through reduction of the potassium influx into the nerve fibres

Last Answer : is transmitted to the brain via the spinothalamic tracts

Compared with myelinated nerve fibres, non-myelinated nerve fibres : a. have a higher threshold for stimulation b. have a longer refractory period c. transmit impulses at a lower frequency d. all above

Description : Compared with myelinated nerve fibres, non-myelinated nerve fibres : a. have a higher threshold for stimulation b. have a longer refractory period c. transmit impulses at a lower frequency d. all above

Last Answer : all above

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

Consider the following statements: 1. Even when a nerve cell is not conducting an impulse, it is actively transporting K+ and Na+ ions in and out respectively against their concentration gradients at the expense of energy 2. As a consequence of the operation of the Na- K pump, there is a concentration gradient for Na+ and K+ ions. 3. As a result, K+ diffuse out of the cell, and Na+ ions into the cell. 4. Eventually, there is difference in charge on either said of the membrane, positive inside and negative outside. Which of the above statements is/are untrue? (a) 1 only (b) 1, 2, 4 (c) 2, 4 (d) 4 only

Description : Consider the following statements: 1. Even when a nerve cell is not conducting an impulse, it is actively transporting K+ and Na+ ions in and out respectively against their concentration gradients at the expense of energy 2. As a ... is/are untrue? (a) 1 only (b) 1, 2, 4 (c) 2, 4 (d) 4 only

Last Answer : Ans:(d)

Explain the mechanism through which a sound produces a nerve impulse in the inner ear. -Biology

Description : Explain the mechanism through which a sound produces a nerve impulse in the inner ear. -Biology

Last Answer : answer:

In the neurones: a. the axons convey impulse away from the cell body b. neurotransmitters are synthesized in the cell bodies and then transported to the axons c. the condition velocity increases with fibre diameter d. the excitability is increased if the extracellular calcium concentration is decreased

Description : In the neurones: a. the axons convey impulse away from the cell body b. neurotransmitters are synthesized in the cell bodies and then transported to the axons c. the condition ... with fibre diameter d. the excitability is increased if the extracellular calcium concentration is decreased

Last Answer : the axons convey impulse away from the cell body

The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is

Description : The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is

Last Answer : The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is

Type of synapse in which transmission of impulse across neuron is similar to conduction along a single axon

Description : Type of synapse in which transmission of impulse across neuron is similar to conduction along a single axon

Last Answer : Type of synapse in which transmission of impulse across neuron is similar to conduction along a single axon

Type of synapse in which transmission of impulse across neuron is similar to conduction along a single axon

Description : Type of synapse in which transmission of impulse across neuron is similar to conduction along a single axon

Last Answer : Type of synapse in which transmission of impulse across neuron is similar to conduction along a single axon

How does body temperature affect the conduction speed of an electrical impulse?

Description : How does body temperature affect the conduction speed of an electrical impulse?

Last Answer : What is the answer ?

Which of the following terms is used to describe a tachycardia characterized by abrupt onset, abrupt cessation, and a QRS of normal duration? a) Paroxysmal atrial tachycardia PAT is often caused by a conduction problem in the AV node and is now called AV nodal reentry tachycardia. b) Sinus tachycardia Sinus tachycardia occurs when the sinus node regularly creates an impulse at a faster-than-normal rate. c) Atrial flutter Atrial flutter occurs in the atrium and creates an atrial rate between 250-400 times per minute. d) Atrial fibrillation Atrial fibrillation causes a rapid, disorganized, and uncoordinated twitching of atrial musculature.

Description : Which of the following terms is used to describe a tachycardia characterized by abrupt onset, abrupt cessation, and a QRS of normal duration? a) Paroxysmal atrial tachycardia PAT ... fibrillation Atrial fibrillation causes a rapid, disorganized, and uncoordinated twitching of atrial musculature.

Last Answer : a) Paroxysmal atrial tachycardia PAT is often caused by a conduction problem in the AV node and is now called AV nodal reentry tachycardia.

When the nurse observes that the patient’s heart rate increases during inspiration and decreases during expiration, the nurse reports that the patient is demonstrating a) sinus dysrhythmia. Sinus dysrhythmia occurs when the sinus node creates an impulse at an irregular rhythm. b) normal sinus rhythm. Normal sinus rhythm occurs when the electrical impulse starts at a regular rate and rhythm in the SA node and travels through the normal conduction pathway. c) sinus bradycardia. Sinus bradycardia occurs when the sinus node regularly creates an impulse at a slower-than-normal rate. d) sinus tachycardia. Sinus tachycardia occurs when the sinus node regularly creates an impulse at a faster-than-normal rate.

Description : When the nurse observes that the patient's heart rate increases during inspiration and decreases during expiration, the nurse reports that the patient is demonstrating a) sinus dysrhythmia. Sinus dysrhythmia ... occurs when the sinus node regularly creates an impulse at a faster-than-normal rate.

Last Answer : a) sinus dysrhythmia. Sinus dysrhythmia occurs when the sinus node creates an impulse at an irregular rhythm.

Which of the following ECG waveforms characterizes conduction of an electrical impulse through the left ventricle? a) QRS complex The QRS complex represents ventricular depolarization b) P wave The P wave is an ECG characteristic reflecting conduction of an electrical impulse through the atria. c) PR interval The PR interval is a component of an ECG tracing reflecting conduction of an electrical impulse through the AV node. d) QT interval The QT interval is an ECG characteristic reflecting the time from ventricular depolarization to repolarization.

Description : Which of the following ECG waveforms characterizes conduction of an electrical impulse through the left ventricle? a) QRS complex The QRS complex represents ventricular depolarization b) P ... QT interval is an ECG characteristic reflecting the time from ventricular depolarization to repolarization.

Last Answer : a) QRS complex The QRS complex represents ventricular depolarization

Which of the following ECG characteristics is usually seen when a patient’s serum potassium level is low? a) U wave The U wave is an ECG waveform characteristic that may reflect Purkinje fiber repolarization. It is usually seen when a patient’s serum potassium level is low. b) T wave The T wave is an ECG characteristic reflecting repolarization of the ventricles. It may become tall or “peaked” if a patient’s serum potassium level is high. c) P wave The P wave is an ECG characteristic reflecting conduction of an electrical impulse through the atria. d) QT interval The QT interval is an ECG characteristic reflecting the time from ventricular depolarization to repolarization.

Description : Which of the following ECG characteristics is usually seen when a patient's serum potassium level is low? a) U wave The U wave is an ECG waveform characteristic that may ... interval The QT interval is an ECG characteristic reflecting the time from ventricular depolarization to repolarization.

Last Answer : a) U wave The U wave is an ECG waveform characteristic that may reflect Purkinje fiber repolarization. It is usually seen when a patient’s serum potassium level is low.

Which term is used to describe the ability of the heart to initiate an electrical impulse? a) Automaticity Automaticity is the ability of specialized electrical cells of the cardiac conduction system to initiate an electrical impulse. b) Contractility Contractility refers to the ability of the specialized electrical cells of the cardiac conduction system to contract in response to an electrical impulse. c) Conductivity Conductivity refers to the ability of the specialized electrical cells of the cardiac conduction system to transmit an electrical impulse from one cell to another. d) Excitability Excitability refers to the ability of the specialized electrical cells of the cardiac conduction system to respond to an electrical impulse.

Description : Which term is used to describe the ability of the heart to initiate an electrical impulse? a) Automaticity Automaticity is the ability of specialized electrical cells of the cardiac conduction ... the specialized electrical cells of the cardiac conduction system to respond to an electrical impulse.

Last Answer : a) Automaticity Automaticity is the ability of specialized electrical cells of the cardiac conduction system to initiate an electrical impulse.

The principal action common to all class I antiarrhythmic drugs is: A. Na+ channel blockade B. K+ channel opening C. Depression of impulse conduction D. Prolongation of effective refractory period

Description : The principal action common to all class I antiarrhythmic drugs is: A. Na+ channel blockade B. K+ channel opening C. Depression of impulse conduction D. Prolongation of effective refractory period

Last Answer : A. Na+ channel blockade

What is the difference between Myelinated and Non-myelinated axons? -Biology

Description : What is the difference between Myelinated and Non-myelinated axons? -Biology

Last Answer : answer:

Direction of nerve impulse is reversed in nerve with

Description : Direction of nerve impulse is reversed in nerve with

Last Answer : Direction of nerve impulse is reversed in nerve with A. Axo -axonic B. Axo-dendrite C. Axo -axondendritic D. None of the above

"Sodium Pump" operates in - (1) Muscle contraction (2) Heart beat (3) Nerve impulse (4) None of the above

Description : "Sodium Pump" operates in - (1) Muscle contraction (2) Heart beat (3) Nerve impulse (4) None of the above

Last Answer : (3) Nerve impulse Explanation: Na+/K+-ATPase (also known as sodium-potassium pump) is an enzyme located in the plasma them brane of virtually every human cell and is common to all cellular ... are voltagegated, which means that they can open and close depending on the voltage across the membrane.

The fastest nerve impulse in humans travel at

Description : The fastest nerve impulse in humans travel at

Last Answer : eight metres per second.

What is nerve impulse?

Description : What is nerve impulse?

Last Answer : These are electrical pulses which travel in the body from CNS to a body parts form the body parts to CNS to carrying different messages.

During the nerve impulse transmission, following ion or ions may play significant roles D A. Sodium B. Potassium C. Chloride D. All of these

Description : During the nerve impulse transmission, following ion or ions may play significant roles D A. Sodium B. Potassium C. Chloride D. All of these

Last Answer : All of these

A nerve impulse is essentially a wave of A A. Electrical charge B. Mechanical Charge C. Magnetic charge D. All of the these

Description : A nerve impulse is essentially a wave of A A. Electrical charge B. Mechanical Charge C. Magnetic charge D. All of the these

Last Answer : Electrical charg

During the nerve impulse transmission, following ion or ions may play significant roles D A. Sodium B. Potassium C. Chloride D. All of these

Description : During the nerve impulse transmission, following ion or ions may play significant roles D A. Sodium B. Potassium C. Chloride D. All of these

Last Answer : All of these

Propagation of action potential is called a. Repolarization b. depolarization c. nerve impulse d. none of them

Description : Propagation of action potential is called a. Repolarization b. depolarization c. nerve impulse d. none of them

Last Answer : nerve impulse

A nerve impulse is essentially a wave of a. mechanical charge b. electrical charge c. Both d. None

Description : A nerve impulse is essentially a wave of a. mechanical charge b. electrical charge c. Both d. None

Last Answer : electrical charge

A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neuro- hormonal control system? (a) Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal medulla. (b) Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse. (c) Hypothalamus activates the parasympathetic division of brain. (d) Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal cortex.

Description : A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neuro- hormonal control system? ... brain. (d) Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal cortex.

Last Answer : (a) Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal medulla.

During the propagation of a nerve impulse, the action potential results from the movement of (a) K+ ions from intracellular fluid to extracellular fluid (b) Na+ ions from extracellular fluid to intracellular fluid (c) K+ ions from extracellular fluid to intracellular fluid (d) Na+ ions from intracellular fluid to extracellular fluid.

Description : During the propagation of a nerve impulse, the action potential results from the movement of (a) K+ ions from intracellular fluid to extracellular fluid (b) Na+ ions from extracellular ... extracellular fluid to intracellular fluid (d) Na+ ions from intracellular fluid to extracellular fluid.

Last Answer : (b) Na+ ions from extracellular fluid to intracellular fluid

Impulse of heart beat originates from (a) SA node (b) AV node (c) vagus nerve (d) cardiac nerve

Description : Impulse of heart beat originates from (a) SA node (b) AV node (c) vagus nerve (d) cardiac nerve

Last Answer : (a) SA node

A resting nerve is relatively resistant to blockade by lignocaine compared to one which is repeatedly stimulated because: A. Lignocaine penetrates resting nerve membrane poorly B. Lignocaine binds more avidly to the inactivated Na+ channel C. Nerve impulse promotes ionization of lignocaine D. Nodes of Ranvier are inaccessible in the resting state

Description : A resting nerve is relatively resistant to blockade by lignocaine compared to one which is repeatedly stimulated because: A. Lignocaine penetrates resting nerve membrane poorly B. Lignocaine binds ... promotes ionization of lignocaine D. Nodes of Ranvier are inaccessible in the resting state

Last Answer : B. Lignocaine binds more avidly to the inactivated Na+ chan

A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neuro-hormonal control system ? (1) Sympathetic nervous system is activated releasing epinephrin and norepinephrin from adrenal cortex (2) Sympathetic nervous system is activated releasing epinephrin and norepinephrin from adrenal medulla (3) Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse (4) Hypothalamus activates the parasympathetic division of brain

Description : A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neuro-hormonal control system ? (1 ... across the cleft and transmit a nerve impulse (4) Hypothalamus activates the parasympathetic division of brain

Last Answer : (2) Sympathetic nervous system is activated releasing epinephrin and norepinephrin from adrenal medulla

Tetrodotoxin blocks nerve impulse/junctional transmission by: A. Anticholinergic action B. Depleting acetylcholine C. Blocking Na+ channels D. Blocking Ca2+ channels

Description : Tetrodotoxin blocks nerve impulse/junctional transmission by: A. Anticholinergic action B. Depleting acetylcholine C. Blocking Na+ channels D. Blocking Ca2+ channels

Last Answer : C. Blocking Na+ channels

Tetrodotoxin blocks nerve impulse/junctional transmission by: A. Anticholinergic action B. Depleting acetylcholine C. Blocking Na+ channels D. Blocking Ca2+ channels

Description : Tetrodotoxin blocks nerve impulse/junctional transmission by: A. Anticholinergic action B. Depleting acetylcholine C. Blocking Na+ channels D. Blocking Ca2+ channels

Last Answer : C. Blocking Na+ channels

“Sodium Pump” operates in (1) Muscle contraction (2) Heart beat (3) Nerve impulse (4) None of the above

Description : “Sodium Pump” operates in (1) Muscle contraction (2) Heart beat (3) Nerve impulse (4) None of the above

Last Answer : Nerve impulse

The following action of digoxin is responsible for beneficial effect in auricular fibrillation: A. Increased myocardial contractility B. Suppression of SA node C. Depression of A-V conduction D. Enhanced Purkinje fibre automaticity

Description : The following action of digoxin is responsible for beneficial effect in auricular fibrillation: A. Increased myocardial contractility B. Suppression of SA node C. Depression of A-V conduction D. Enhanced Purkinje fibre automaticity

Last Answer : C. Depression of A-V conduction

What is myelinated neuron? -Biology

Description : What is myelinated neuron? -Biology

Last Answer : answer:

What is non-myelinated neuron? -Biology

Description : What is non-myelinated neuron? -Biology

Last Answer : answer:

Tract of nerve fibre which connects both cerebral hemisphere is

Description : Tract of nerve fibre which connects both cerebral hemisphere is

Last Answer : Tract of nerve fibre which connects both cerebral hemisphere is

Bulb like structure where branch of nerve fibre terminates

Description : Bulb like structure where branch of nerve fibre terminates

Last Answer : Bulb like structure where branch of nerve fibre terminates

Tract of nerve fibre which connects both cerebral hemisphere is

Description : Tract of nerve fibre which connects both cerebral hemisphere is

Last Answer : Tract of nerve fibre which connects both cerebral hemisphere is

Bulb like structure where branch of nerve fibre terminates

Description : Bulb like structure where branch of nerve fibre terminates

Last Answer : Bulb like structure where branch of nerve fibre terminates

Can a nerve fibre and nerve both carry sensory and motor impulses?

Description : Can a nerve fibre and nerve both carry sensory and motor impulses?

Last Answer : There are the Mixed Nerves in the spinal column that carry bothsensory and motor nerves, but these neurons have 2 different jobsthat they do,& I know of no neurons doing both as the impulsestravel to 2 different locations which couldn't be done at the sametime.

The connective tissue layer that surrounds each individual fibre in the nerve is (a) epineurium (b) perineurium (c) perineural septum (d) endoneurium

Description : The connective tissue layer that surrounds each individual fibre in the nerve is (a) epineurium (b) perineurium (c) perineural septum (d) endoneurium

Last Answer : Ans:(d)

What is the difference between impulse conduction in a myelinated nerve fibre and unmyelinated nerve fibre? -Biology

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