Question 1

Which of the following best describes the primary function of the myelin sheath in a neuron?

Accepted Answer

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

Question 2

A patient suffers from multiple sclerosis, a disease that damages the myelin sheath. Which of the following symptoms is most likely to occur as a result?

Accepted Answer

Slower and disrupted transmission of nerve impulses.

Question 3

Which part of the neuron is primarily responsible for receiving incoming signals from other neurons?

Accepted Answer

Dendrites

Question 4

During an action potential, which of the following sequences correctly describes the changes in membrane potential?

Accepted Answer

Resting potential → Depolarization → Repolarization → Back to resting potential

Question 5

Which of the following best explains the difference between the central nervous system (CNS) and the peripheral nervous system (PNS)?

Accepted Answer

The CNS consists of the brain and spinal cord, while the PNS includes all nerves outside the CNS.

Question 6

A person touches a hot stove and quickly withdraws their hand. Which part of the nervous system is primarily responsible for this rapid, involuntary response?

Accepted Answer

Central nervous system (spinal reflex)

Question 7

Which of the following is a function of glial cells in the nervous system?

Accepted Answer

Supporting, nourishing, and insulating neurons

Question 8

If the terminal buttons of a neuron are damaged, which process would be most directly affected?

Accepted Answer

Releasing neurotransmitters into the synaptic cleft

Question 9

Which equation best represents the relationship between the speed of a nerve impulse ($$v$$), the length of the axon ($$L$$), and the time ($$t) it $$takes for the impulse to travel the length of the axon?

Accepted Answer

$$v = \frac{L}{t}$$

Question 10

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

Accepted Answer

It carries nerve impulses between the CNS and skeletal muscles, enabling voluntary movements.

Question 11

A patient with damage to Broca’s area in the frontal lobe would most likely experience which of the following symptoms?

Accepted Answer

Difficulty forming speech

Question 12

Which lobe of the cerebral cortex is primarily responsible for processing visual information?

Accepted Answer

Occipital lobe

Question 13

Which of the following best describes the role of the autonomic nervous system?

Accepted Answer

It is responsible for involuntary functions such as heart rate and digestion.

Question 14

A person is startled by a loud noise, causing their heart rate to increase and pupils to dilate. Which subdivision of the autonomic nervous system is primarily responsible for these changes?

Accepted Answer

Sympathetic nervous system

Question 15

Which of the following statements about neurotransmitters is correct?

Accepted Answer

Neurotransmitters can be either excitatory or inhibitory.

Question 16

Which area of the brain is most closely associated with executive functions such as planning, impulse control, and motivation?

Accepted Answer

Frontal lobe

Question 17

A person has difficulty comprehending spoken language but can produce speech that lacks meaning. Which brain area is most likely damaged?

Accepted Answer

Wernicke's area

Question 18

Which of the following best describes the function of the endocrine system?

Accepted Answer

It utilizes hormones secreted into the blood to regulate long-term bodily processes.

Question 19

If a person has damage to the somatosensory cortex, which of the following symptoms would most likely occur?

Accepted Answer

Impaired ability to interpret bodily sensations such as touch and pain

Question 20

Which of the following best explains why the size of a body part's representation in the motor cortex does not correspond to its physical size?

Accepted Answer

It is determined by the precision and complexity of movements the body part can perform.

Chapter 3: Biology & Neuroscience – Nervous System Structure and Function

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