Question 1

Which of the following best describes the main function of the nervous system?

Accepted Answer

It controls voluntary movement and is the seat of consciousness, personality, and learning.

Question 2

How many pairs of cranial nerves travel back to or from the brain?

Accepted Answer

12

Question 3

Which structural division of the nervous system includes the brain and spinal cord?

Accepted Answer

Central nervous system (CNS)

Question 4

What is the primary role of sensory (afferent) neurons?

Accepted Answer

To carry information from sensory receptors to the central nervous system

Question 5

Which part of the neuron is responsible for manufacturing all the proteins needed for the neuron and housing many organelles?

Accepted Answer

Soma (cell body)

Question 6

Which of the following best describes the function of the myelin sheath?

Accepted Answer

It increases the speed of electrical signal conduction along the axon.

Question 7

What is the resting membrane potential of a typical neuron?

Accepted Answer

$$-70\ \mathrm{mV}$$

Question 8

Which ion is primarily responsible for depolarization during an action potential?

Accepted Answer

Sodium ($$\mathrm{Na^+})$$

Question 9

During repolarization of the neuron membrane, which ion moves out of the cell?

Accepted Answer

Potassium ($$\mathrm{K^+})$$

Question 10

Which of the following best describes the 'all-or-none' principle of action potentials?

Accepted Answer

An action potential either occurs fully or not at all, depending on whether threshold is reached.

Question 11

Which neurotransmitter is widely used by the nervous system and is quickly degraded by acetylcholinesterase?

Accepted Answer

Acetylcholine (ACh)

Question 12

What is the main function of the postsynaptic neuron?

Accepted Answer

To receive and respond to neurotransmitters released by the presynaptic neuron

Question 13

Which of the following is a function of neuroglial cells?

Accepted Answer

Providing structural support and protection for neurons

Question 14

Which type of ion channel is responsible for the rapid depolarization phase of the action potential?

Accepted Answer

Voltage-gated sodium channels

Question 15

What is the main difference between graded (local) potentials and action potentials?

Accepted Answer

Graded potentials are reversible and vary in size, while action potentials are irreversible and all-or-none.

Question 16

Which of the following events occurs first during synaptic transmission at a chemical synapse?

Accepted Answer

An action potential in the presynaptic neuron triggers voltage-gated calcium ion channels to open.

Question 17

Which of the following best describes the propagation of an action potential along a myelinated axon?

Accepted Answer

Saltatory conduction, where the action potential jumps from node to node

Question 18

Which neurotransmitter is classified as a biogenic amine and is involved in mood regulation?

Accepted Answer

Serotonin

Question 19

What is the main function of neural integration in the CNS?

Accepted Answer

To process and interpret incoming sensory information and determine appropriate responses

Question 20

Which of the following is true about the regeneration of nervous tissue?

Accepted Answer

Regeneration is nearly non-existent in the CNS and limited in the PNS.

Nervous System and Nervous Tissue: Structure, Function, and Electrophysiology

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