Question 1

Which of the following best describes the role of glial cells in the nervous system?

Accepted Answer

They form myelin, support neurons, and help remove waste.

Question 2

A patient with multiple sclerosis experiences erratic neural signals. This is primarily due to:

Accepted Answer

Loss of myelin sheaths around axons.

Question 3

During the resting potential of a neuron, which of the following is true?

Accepted Answer

The inside of the neuron is negative relative to the outside.

Question 4

Which law states that a neuron either fires completely or not at all, depending on whether it reaches the threshold?

Accepted Answer

All-or-None Law

Question 5

What is the primary function of dendrites in a neuron?

Accepted Answer

Receive information from other neurons.

Question 6

Which process occurs immediately after a neuron fires an action potential?

Accepted Answer

Potassium ($$K^+) $$ions flow out, repolarizing the neuron.

Question 7

A neuron is stimulated by a nearby neuron and its gates open, allowing positive ions to rush in. What is this process called?

Accepted Answer

Depolarization

Question 8

Which of the following best explains why neurons do not touch each other?

Accepted Answer

Neurotransmitters must travel across the synaptic gap to reach the next neuron.

Question 9

If the frequency of action potentials increases in a neuron, what does this indicate about the intensity of the message being sent?

Accepted Answer

The intensity is higher because messages are sent more often.

Question 10

Which of the following is the correct sequence of events in neural communication?

Accepted Answer

Resting potential → action potential → depolarization → repolarization → refractory period

Question 11

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

Accepted Answer

It increases the speed and efficiency of neural communication.

Question 12

A person is unable to fire a neuron no matter how strong the stimulus, immediately after an action potential. This period is known as:

Accepted Answer

Refractory period

Question 13

Which of the following is true about the synapse?

Accepted Answer

It is the location where neurotransmitters are released to communicate with the next neuron.

Question 14

Which of the following would most likely occur if the gates on a neuron's membrane were not selectively permeable?

Accepted Answer

The neuron would be unable to maintain a resting potential.

Question 15

Which equation best represents the change in membrane potential during depolarization?

Accepted Answer

$$V_{membrane} = V_{rest} + \Delta V_{Na^+}$$

Question 16

Which of the following is a direct consequence of the 'all-or-none' law in neural firing?

Accepted Answer

A neuron fires only if the threshold is reached, otherwise it does not fire at all.

Question 17

Which of the following best explains why the loss of myelin leads to symptoms in multiple sclerosis?

Accepted Answer

It causes erratic transmission of electrical signals along axons.

Question 18

Which step in neural firing involves the neuron returning to its negative resting state after an action potential?

Accepted Answer

Repolarization

Question 19

If a neuron is unable to fire again immediately after an action potential, this is due to:

Accepted Answer

The neuron being in the refractory period.

Question 20

Which of the following is NOT a function of glial cells?

Accepted Answer

Transmitting electrical impulses

Biological Psychology: Neurons, Neural Communication, and the Nervous System

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