Question 1

Which of the following best describes the function of oligodendrocytes in the central nervous system?

Accepted Answer

They form the myelin sheath around axons, increasing the speed of nerve impulse conduction.

Question 2

A patient suffers a spinal cord injury that damages the dorsal root of a spinal nerve. Which function is most likely to be impaired?

Accepted Answer

Transmission of sensory information from the body to the spinal cord.

Question 3

Which equation best represents the Nernst equation for calculating the equilibrium potential ($$E_{ion}) $$for a given ion across a membrane?

Accepted Answer

$$E_{ion} = \frac{RT}{zF} \ln \left( \frac{[ion]_{outside}}{[ion]_{inside}} \right)$$

Question 4

During the propagation of an action potential along a myelinated axon, which process occurs at the nodes of Ranvier?

Accepted Answer

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

Question 5

A patient is unable to coordinate repetitive body movements and maintain balance. Which brain structure is most likely affected?

Accepted Answer

Cerebellum

Question 6

Which of the following best describes the function of the blood-brain barrier?

Accepted Answer

It selectively restricts the passage of substances from the blood into the brain tissue.

Question 7

Which neurotransmitter is primarily released at neuromuscular junctions to stimulate skeletal muscle contraction?

Accepted Answer

Acetylcholine (ACh)

Question 8

A person touches a hot stove and quickly withdraws their hand. Which type of neuron is responsible for transmitting the pain signal from the hand to the spinal cord?

Accepted Answer

Sensory neuron

Question 9

Which of the following is a function of the hypothalamus?

Accepted Answer

Regulation of hormone production and homeostatic functions such as temperature and hunger.

Question 10

Which of the following best explains why action potentials are unidirectional along an axon?

Accepted Answer

The refractory period prevents the action potential from traveling backward.

Question 11

Which meningeal layer is directly attached to the surface of the brain and spinal cord?

Accepted Answer

Pia mater

Question 12

A patient has difficulty forming new memories after a traumatic brain injury. Which brain system is most likely affected?

Accepted Answer

Limbic system

Question 13

Which of the following best describes the function of astrocytes in the central nervous system?

Accepted Answer

They maintain the blood-brain barrier and provide structural support for neurons.

Question 14

Which of the following is true regarding graded potentials?

Accepted Answer

They can summate and may lead to the generation of an action potential if threshold is reached.

Question 15

Which region of the brain is responsible for processing and relaying sensory information to the appropriate areas of the cerebral cortex?

Accepted Answer

Thalamus

Question 16

A patient presents with loss of voluntary motor control on the right side of the body. Which area of the brain is most likely damaged?

Accepted Answer

Left primary motor cortex

Question 17

Which of the following best describes the function of the basal nuclei?

Accepted Answer

They help control and coordinate voluntary movement patterns.

Question 18

Which of the following is a characteristic of the sympathetic division of the autonomic nervous system?

Accepted Answer

It prepares the body for 'fight or flight' responses.

Question 19

Which of the following best explains the role of voltage-gated sodium channels during the generation of an action potential?

Accepted Answer

They open rapidly in response to depolarization, allowing $$Na^+ to $$enter the cell and further depolarize the membrane.

Question 20

A patient is unable to understand spoken language but can speak fluently, although the words make little sense. Which area of the brain is most likely damaged?

Accepted Answer

Wernicke's area

Chapter 8: The Nervous System – Anatomy & Physiology Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard