Physiology Of Nerve By Dr. Ehab Shokry

2.

Types of junctions may be

Synapse
MEP
Neuro - epithelial
All of the above

Correct Answer

A. All of the above

Explanation

The correct answer is "All of the above" because the question asks for the types of junctions, and all three options listed (Synapse, MEP, Neuro-epithelial) are different types of junctions. Therefore, all of these options are correct and can be considered as types of junctions.

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3.

The RMP is du to

Hyperpolarized state
Isopotential state
Polarized state
Action potential

Correct Answer

A. Polarized state

Explanation

The correct answer is "Polarized state." In a polarized state, there is a difference in electrical charge between the inside and outside of a cell membrane. This difference in charge is maintained by the active transport of ions across the membrane, creating an electrical potential. This polarized state is necessary for the generation of an action potential, which is a rapid change in electrical potential that allows for the transmission of signals in the nervous system.

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4.

The narrower the diameter of the nerve trunk

The greater is the velocity
The bigger is the magnitude
The greater the duration
The easier the conduction

Correct Answer

A. The greater the duration

5.

Energy consumption at the neural level

During the action potential
During repolarization
During the polarized state
All of the above

Correct Answer

A. All of the above

Explanation

All of the above options contribute to energy consumption at the neural level. During the action potential, energy is required for the propagation of the electrical signal along the neuron. During repolarization, energy is needed to restore the ion concentration gradients across the cell membrane. Even during the polarized state, when the neuron is at rest, energy is still consumed to maintain the ion gradients and to support various cellular processes. Therefore, all of these states require energy consumption at the neural level.

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6.

The excitable tissue

Give a stimulus by response
Contracts by electrical changes
Conducts by contraction
None of the above

Correct Answer

A. Contracts by electrical changes

Explanation

Excitable tissue contracts by electrical changes because it is made up of cells that have the ability to generate and transmit electrical impulses. These electrical changes occur when ions move across the cell membrane, causing a change in the membrane potential. This change in electrical potential triggers the contraction of the excitable tissue, allowing it to respond to stimuli.

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7.

Which one do you like?

Option 1
Option 2
Option 3
Option 4

Correct Answer

A. Option 1

8.

The supernormal phase is due to

Decrease the threshold
Decrease the excitability
Decrease the permeability
Decrease the activity

Correct Answer

A. Decrease the threshold

Explanation

The supernormal phase occurs when the threshold for excitation is decreased. This means that it takes less stimulation for a neuron to reach its firing threshold and generate an action potential. As a result, the neuron becomes more excitable and is able to fire more easily. This can lead to an increase in the frequency of action potentials and a prolonged period of excitability.

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9.

The Chronaxie is the time needed for

Excitation of the nerve
Contraction of the muscle
Conduction of impulse
All of the above

Correct Answer

A. Excitation of the nerve

Explanation

The Chronaxie is the time needed for the excitation of the nerve. It refers to the minimum duration of an electric stimulus required to generate an action potential in a nerve fiber. This means that it is the time needed for the nerve to reach its threshold and initiate an impulse. The contraction of the muscle and conduction of the impulse are not directly related to the Chronaxie, as they involve different processes and timeframes. Therefore, the correct answer is "Excitation of the nerve".

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10.

Temporal summation

Due to Action potential
Couses Action potential
Under the all or none rule
Has a refractory period

Correct Answer

A. Couses Action potential

Explanation

The given answer suggests that the action potential is caused by temporal summation. Temporal summation refers to the accumulation of small, sub-threshold stimuli over time, which can eventually reach the threshold required for an action potential to be generated. This process involves the integration of multiple inputs from different synapses or neurons, leading to the depolarization of the neuron's membrane and the initiation of an action potential. Therefore, the correct answer implies that temporal summation plays a crucial role in generating action potentials.

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11.

Alkalosis causes

Membrane stabilization
Nerve block
Convulsions
None of the above

Correct Answer

A. Convulsions

Explanation

Alkalosis is a condition characterized by an increase in the pH levels of the blood, making it more alkaline. This disrupts the balance of electrolytes in the body, leading to various symptoms. Convulsions refer to involuntary muscle contractions and spasms, which can be a result of alkalosis. When the pH levels are too high, it can affect the normal functioning of the nervous system, leading to convulsions. Therefore, convulsions can be caused by alkalosis.

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12.

The Delayed amount of heat

Is 9 times the initial one
Is 10 times the initial one
Due to the spike potential
Due to anaerobic reactions

Correct Answer

A. Is 10 times the initial one

Explanation

The correct answer is "Is 10 times the initial one." This suggests that the delayed amount of heat is 10 times greater than the initial amount. This could be due to various factors such as increased energy input, accumulation of heat over time, or a specific reaction that occurs after the initial heat is generated. Without further context, it is difficult to determine the exact reason for this increase in heat.

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13.

The couse of the polarized state is

The K outflux
The Na influx
The Na-K pump
None of the above

Correct Answer

A. None of the above

Explanation

The answer "None of the above" is correct because the question is asking about the cause of the polarized state, and none of the options provided (K outflux, Na influx, Na-K pump) directly explain the cause of polarization. The polarized state is typically caused by the unequal distribution of ions across the cell membrane, with more positive ions outside the cell and more negative ions inside. This imbalance creates an electrical potential difference, resulting in the polarized state.

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14.

The slow outflux of K is the couse of

Depolarization
After depolarizatio
Repolarization
After hyperpolarization

Correct Answer

A. After depolarizatio

Explanation

The slow outflux of K ions after depolarization is the cause of repolarization. During depolarization, the membrane potential becomes more positive, and this is mainly due to the influx of Na ions. After depolarization, the slow outflux of K ions helps to restore the membrane potential back to its resting state by making the inside of the cell more negative again. This process is known as repolarization and is crucial for the proper functioning of nerve cells and muscle cells. After hyperpolarization refers to a further decrease in membrane potential below the resting state, which is not directly related to the slow outflux of K ions after depolarization.

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Physiology Of Nerve By Dr. Ehab Shokry

......... is a part of the PNS

Quiz Preview

Types of junctions may be

The RMP is du to

The narrower the diameter of the nerve trunk

Energy consumption at the neural level

The excitable tissue

Which one do you like?

The supernormal phase is due to

The Chronaxie is the time needed for

Temporal summation

Alkalosis causes

The Delayed amount of heat

The couse of the polarized state is

The slow outflux of K is the couse of