Question 1

Which of the following best describes the structural divisions of the nervous system?

Accepted Answer

Central Nervous System (CNS) and Peripheral Nervous System (PNS)

Question 2

A bundle of axons found in the Peripheral Nervous System is called:

Accepted Answer

Nerve

Question 3

Which of the following is NOT a function of the myelin sheath?

Accepted Answer

Providing structural support for the neuron

Question 4

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

Accepted Answer

Dendrites

Question 5

If a patient has damage to the dorsal root ganglion, which function is most likely to be impaired?

Accepted Answer

Sensory input from the periphery

Question 6

Which equation best represents the relationship between conduction velocity ($$v) $$and axon diameter ($$d) in $$myelinated axons?

Accepted Answer

$$v \approx k \sqrt{d}$$

Question 7

Which of the following correctly matches a cluster of neuron cell bodies with its location?

Accepted Answer

Nucleus in the CNS

Question 8

A patient presents with slowed nerve impulse conduction. Which of the following is the most likely cause?

Accepted Answer

Loss of myelin sheath

Question 9

Which functional division of the Peripheral Nervous System is responsible for voluntary control of skeletal muscles?

Accepted Answer

Somatic nervous system

Question 10

Which of the following best describes the flow of information in the nervous system?

Accepted Answer

Sensory receptors → CNS → Motor division → Effectors

Question 11

Which of the following is TRUE regarding unmyelinated axons?

Accepted Answer

They conduct impulses more slowly than myelinated axons

Question 12

Which cell type is responsible for myelinating axons in the CNS?

Accepted Answer

Oligodendrocyte

Question 13

A nerve plexus is best described as:

Accepted Answer

A bundle of nerves in the PNS

Question 14

Which of the following is a direct effect of myelination on action potential propagation?

Accepted Answer

Saltatory conduction between nodes of Ranvier

Question 15

Which equation represents the total number of cranial and spinal nerve pairs in the human body?

Accepted Answer

$$N = 12 + 31 = 43$$

Question 16

Which of the following neuron components is responsible for initiating the action potential?

Accepted Answer

Axon hillock

Question 17

Which of the following is NOT found in the cytoplasm of the neuron cell body?

Accepted Answer

Centrioles

Question 18

A patient with multiple sclerosis is experiencing muscle weakness. Which process is most directly affected?

Accepted Answer

Myelination of axons

Question 19

Which of the following best describes the role of chromatophilic substance in neurons?

Accepted Answer

Protein synthesis

Question 20

Which of the following is a correct sequence for the flow of information from sensory input to motor output in the nervous system?

Accepted Answer

Sensory receptor → Sensory neuron → CNS → Motor neuron → Effector

Divisions of the Nervous System and Neuron Structure

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