Question 1

Which of the following best describes the primary function of neurons in the nervous system?

Accepted Answer

Neurons communicate via electrical and chemical signals.

Question 2

Glial cells differ from neurons in that glial cells:

Accepted Answer

Support, nourish, and protect neurons.

Question 3

Which of the following pathways correctly describes the flow of information from the environment to a muscle response?

Accepted Answer

Sensory neuron → Spinal cord → Motor neuron → Muscle fiber

Question 4

Which part of the neuron is primarily responsible for receiving chemical messages from other neurons?

Accepted Answer

Dendrites

Question 5

The myelin sheath is essential for:

Accepted Answer

Increasing the speed of electrical signal conduction along the axon.

Question 6

Which structure is formed by the gaps in the myelin sheath along the axon?

Accepted Answer

Nodes of Ranvier

Question 7

A patient with Multiple Sclerosis (MS) experiences muscle weakness and vision loss. Which of the following best explains these symptoms?

Accepted Answer

Loss of myelin prevents efficient neural communication.

Question 8

Which of the following statements about myelin is accurate?

Accepted Answer

Myelin is a layer of fatty tissue that covers and insulates the axon.

Question 9

Which type of neuron carries signals from the central nervous system to muscles to produce movement?

Accepted Answer

Motor neuron

Question 10

If the myelin sheath is damaged, which of the following is most likely to occur?

Accepted Answer

Electrical signals will slow down or be disrupted.

Question 11

Which of the following best describes the role of the soma in a neuron?

Accepted Answer

It contains the nucleus and organelles.

Question 12

Which of the following equations best represents the speed of signal conduction in a myelinated axon compared to an unmyelinated axon?

Accepted Answer

$$v_{myelinated} \u003e v_{unmyelinated}$$

Question 13

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

Accepted Answer

Transmitting electrical signals

Question 14

A researcher is studying the effect of demyelination on nerve conduction. Which structure should they focus on to observe the greatest change in signal speed?

Accepted Answer

Nodes of Ranvier

Question 15

Which of the following best explains why myelinated axons conduct signals faster than unmyelinated axons?

Accepted Answer

Myelin allows electrical signals to jump between nodes of Ranvier.

Question 16

Which of the following statements is true regarding the anatomy of a neuron?

Accepted Answer

Axon terminals release neurotransmitters into the synapse.

Question 17

In a reflex arc, which type of neuron transmits signals from the sensory neuron to the motor neuron within the spinal cord?

Accepted Answer

Interneuron

Question 18

Which of the following is a consequence of loss of myelin in diseases such as Multiple Sclerosis?

Accepted Answer

Blocked release of chemical messengers

Question 19

Which of the following best describes the relationship between glial cells and myelin?

Accepted Answer

Glial cells produce myelin to insulate axons.

Question 20

Which of the following is the correct order of signal transmission in a typical neuron?

Accepted Answer

Dendrite → Soma → Axon → Axon terminal

Cells of the Nervous System: Neurons and Glial Cells

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