Question 1

Which of the following best describes the role of myelin in the conduction of electrical impulses along a neuron?

Accepted Answer

Myelin acts as an insulator, allowing for saltatory conduction and increasing the speed of impulse transmission.

Question 2

A patient is tested for reaction time using a visual stimulus. Which neural pathway is primarily involved in this response?

Accepted Answer

Sensory neuron → interneuron → motor neuron

Question 3

During a reflex arc, which structure is responsible for integrating sensory input and generating a motor output?

Accepted Answer

Interneuron in the spinal cord

Question 4

Which of the following is NOT a component of a typical motor neuron?

Accepted Answer

Schwann cell body

Question 5

If the reaction time for a tactile stimulus is measured as $0.25$ seconds and the reaction time for a visual stimulus is $0.35$ seconds, what is the difference in reaction times?

Accepted Answer

$0.10$ seconds

Question 6

Which of the following structures connects the two cerebral hemispheres and allows for communication between them?

Accepted Answer

Corpus callosum

Question 7

A lesion in the ventral root of the spinal cord would most likely result in which of the following deficits?

Accepted Answer

Loss of motor output to muscles

Question 8

Which meningeal layer is closest to the brain tissue?

Accepted Answer

Pia mater

Question 9

In a cross-section of a nerve, which structure surrounds individual axons?

Accepted Answer

Endoneurium

Question 10

Which of the following best describes the flow of cerebrospinal fluid (CSF) in the brain?

Accepted Answer

CSF is produced in the choroid plexus, circulates through the ventricles, and is reabsorbed in the arachnoid villi.

Question 11

A sheep brain is dissected and the sagittal section is observed. Which structure is most prominent in the midline?

Accepted Answer

Corpus callosum

Question 12

Which of the following is the correct order of connective tissue wrappings from outermost to innermost in a peripheral nerve?

Accepted Answer

Epineurium → Perineurium → Endoneurium

Question 13

Which part of the brain is primarily responsible for coordination and balance?

Accepted Answer

Cerebellum

Question 14

If a patient has damage to the dorsal root of a spinal nerve, which function is most likely impaired?

Accepted Answer

Sensory function

Question 15

Which of the following is a correct description of the function of Schwann cells?

Accepted Answer

They form the myelin sheath around axons in the peripheral nervous system.

Question 16

A student is asked to identify the gray matter in a spinal cord cross-section. Which of the following best describes its location?

Accepted Answer

Gray matter is located in the central region, forming an H-shaped structure.

Question 17

Which of the following structures is NOT part of the reflex arc?

Accepted Answer

Cerebral cortex

Question 18

If the conduction velocity of a myelinated axon is $120$ m/s and the length of the axon is $0.6$ meters, how long does it take for an impulse to travel the entire length?

Accepted Answer

$0.005$ seconds

Question 19

Which of the following best explains why chemical synapses are slower than electrical synapses?

Accepted Answer

Chemical synapses require neurotransmitter release and binding, which takes time.

Question 20

Which of the following is the correct sequence of events in a simple knee-jerk reflex?

Accepted Answer

Stimulus → Sensory neuron → Interneuron → Motor neuron → Effector

Nervous System Structure and Function: Study Guide for Units 14 & 15

Study Guide - Practice Questions

Study Guide - Flashcards