1. Nissl bodies are: A) the microtubules involved in fast axonal transport B) cl

ID: 3515672 • Letter: 1

Question

1. Nissl bodies are:

A) the microtubules involved in fast axonal transport

B) clusters of rough ER in the cell body

C) gaps in the myelin sheath

D) clusters of cell bodies in the CNS

E) clusters of cell bodies in the PNS

2. The absolute refractory period is the time...

A) it takes a neurotransmitter to diffuse across a synaptic cleft

B) it takes to reach threshold via temporal summation

C) following birth when neurons can still reproduce

D) between innjury to an axon and recovery of function

E) following an action potential during which a second action potential cannot be initiated regardless of stimulus strength

3. A resting membrane potential is due to:

A) extracellular fluid rich in sodium

B) intracellular fluid rich in potassium

C) plasma membrane that is more permeable to potassium than sodium

D) all are correct

4. A local anesthetic functions by blocking:

A) the opening of potassium channels

B) the opening of sodium channels

C) the closing o potassium channels

D) the clolsing of sodium channels

5. The type A neurons:

A) are all myelinated

B) are the largest neurons in diameter

C) exhibit saltatory conduction

D) carry motor neurons

E) All of the above

Ans1- B) clusters of rough ER in the cell body

Ans2-E) following an action potential during which a second action potential cannot be initiated regardless of stimulus strength

Ans3-D) all are correct

Ans4-B) the opening of sodium channels

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