unit 7 test Exam Questions and Answers Graded A+

unit 7 test Exam Questions and Answers
Graded A+

In a neuron, the correct order of structures that a nerve impulse passes through is -

Correct answer-dendrite, cell body, axon

Depolarization of a nerve cell is caused by:

Select one:

a.

the sodium potassium pump.

b.

a return of membrane potential to -60mV.

c.

the opening of the potassium gates.

d.

sodium ions entering the cell. - Correct answer-d



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,In an axon, the nerve impulses normally travel:

Select one:

a.

away from the cell body.

b.

toward the cell body.

c.

in both directions.

d.

faster as they are unmyelinated - Correct answer-a

The diagram shows part of a dendrite. A role of structure X (pump) is to




Select one:

a.

move sodium across the membrane.

b.


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, secrete the myelin sheath.

c.

release calcium at the synaptic ending.

d.

identify the cell to phagocytes. - Correct answer-a

Using the information below, what is the correct order for the transmission of an

impulse across a synapse?




1. calcium interacts with protein

2. vesicles fuse with synaptic membrane

3. neurotransmitter diffuses into synaptic cleft

4. receptor sites are occupied

Select one:

a.

2, 3, 1, 4

b.


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