Question 25 (1 point) The change from a positive to negative charge is termed (i

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Question 25 (1 point)

The change from a positive to negative charge is termed (i.e. change from +30mV to -70mV is known as...)

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Question 25 options:

action potential

repolarization

depolarization

absolute refractory period

resting period

answer not listed

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Question 26 (1 point)

A neuron has initiated one action potential. Before it can generate a second impulse:

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Question 26 options:

The membrane potential must be reestablished

Voltage gated Na channels must open to reestablish the membrane potential

answer not listed

Na ions must be pumped out of a cell, thereby reestablishing membrane potential

All proteins involved in action potentials must be resynthesized (newly synthesized)

K ions must be pumped into a cell, thereby reestablishing membrane potential

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Question 27 (1 point)

Consider a resting cell is normally -70mV, what term is used to describe this cell if the voltage is -60mV?

Note: Threshold is at -55mV

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Question 27 options:

can not determine based on information given

fully depolarized

repolarized

hyperpolarized

slightly depolarized

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Question 28 (1 point)

Which of the following nerve fibers would transmit an action potential the QUICKEST?

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Question 28 options:

can not determine based on information given

a neuron with a SMALL diameter and is UNMYELINATED

a neuron with a LARGE diameter and is UNMYELINATED

a neuron with a LARGE diameter and is MYELINATED

a neuron with a SMALL diameter and is MYELINATED

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Question 29 (1 point)

Which ciliated neuroglial cell plays a role in moving cerebrospinal fluid?

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Question 29 options:

Neurons

Ependymal cells

Schwann cells

Oligodendrocytes

Astrocytes

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Question 30 (1 point)

The potassium gradient across the cellular membrane is the most important factor in establishing the membrane potential of the excitable tissues (e.g. myocardium, heart muscle);

If extracellular potassium levels increase, more K will likely be found within a cell, causing the cell to...

SELECT ONE ANSWER.

Question 30 options:

can not determine based on information given

fully depolarize

hyperpolarize

repolarize

slightly depolarize

action potential

repolarization

depolarization

absolute refractory period

resting period

answer not listed

Explanation / Answer

Q.no. 25 The change from a positive to negative charge(+30mV to -70mV) is known as 'repolaristion'.

Q.no. 26. A neuron has initiated one action potential before it can generate a second action potential, the reason may be 'voltage gated Na channels must open to reestablish the membrane potential.

Q.no. 27 If the voltage is -60mV, it is described as 'repolarised'

Q.no 28 The quickest action potential is seen in neuron with a large diameter and myelinated axon.

Q.no 29 The ciliated neuroglial cells which help in the flow of cerebro spinal fluid are 'Ependymal cells'.

Q.no 30 If extracellular potassium levels increase, by which more K levels are seen inside a cell, causing the cell to slightly depolarise as the positive charge slightly increases.

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