Question 1

Which of the following best describes the function of the peripheral nervous system (PNS)?

Accepted Answer

It connects the central nervous system (CNS) to limbs and organs, serving as a communication relay.

Question 2

A patient presents with loss of sensation and movement in the right arm. Which spinal nerve group is most likely affected?

Accepted Answer

Cervical nerves

Question 3

Which of the following is TRUE regarding spinal nerves?

Accepted Answer

They are mixed, carrying both sensory and motor information.

Question 4

Which step in the reflex arc involves the processing of information within the central nervous system?

Accepted Answer

Information processing

Question 5

A person quickly withdraws their hand after touching a hot stove. Which type of reflex is this?

Accepted Answer

Withdrawal (flexor) reflex

Question 6

Which of the following is a characteristic of a monosynaptic reflex?

Accepted Answer

The sensory neuron synapses directly on the motor neuron.

Question 7

The patellar (knee jerk) reflex is an example of which type of reflex?

Accepted Answer

Monosynaptic reflex

Question 8

Which sensory receptor is responsible for detecting muscle stretch in the stretch reflex?

Accepted Answer

Muscle spindle

Question 9

Which of the following best explains the difference between somatic and visceral reflexes?

Accepted Answer

Somatic reflexes control skeletal muscle, while visceral reflexes control activities of other systems such as glands and cardiac muscle.

Question 10

Which equation correctly represents the total number of spinal nerves in the human body?

Accepted Answer

$$8 + 12 + 5 + 5 + 1 = 31$$

Question 11

Which of the following is an example of an acquired reflex?

Accepted Answer

Braking a car for a hazard

Question 12

A patient demonstrates a Babinski sign when the sole of the foot is stroked. What does this indicate?

Accepted Answer

Possible damage to the corticospinal tract

Question 13

Which of the following statements about polysynaptic reflexes is correct?

Accepted Answer

They produce more complicated responses than monosynaptic reflexes.

Question 14

During a crossed extensor reflex, what happens to the limb opposite the one experiencing a painful stimulus?

Accepted Answer

It extends to support body weight.

Question 15

Which of the following best describes the role of the brain in spinal reflexes?

Accepted Answer

The brain can facilitate or inhibit motor patterns based in the spinal cord.

Question 16

Which of the following is NOT a step in the reflex arc?

Accepted Answer

Release of neurotransmitter into the bloodstream

Question 17

If a person’s plantar reflex is replaced by a Babinski sign, what does this suggest about their nervous system?

Accepted Answer

Possible damage to descending motor pathways

Question 18

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

Accepted Answer

Interpretation of sensory input

Question 19

Which reflex classification is based on the complexity of the neural circuit?

Accepted Answer

Monosynaptic vs. polysynaptic reflexes

Question 20

A patient is unable to maintain an upright posture due to a loss of postural reflexes. Which type of reflex is most likely impaired?

Accepted Answer

Monosynaptic stretch reflex

The Peripheral Nervous System and Reflex Activity (Chapter 13): Study Notes

Study Guide - Practice Questions