Q: Which equation best represents the pathway of a monosynaptic reflex arc?

$$\text{Receptor} \rightarrow \text{Sensory neuron} \rightarrow \text{Motor neuron} \rightarrow \text{Effector}$$

Question 1

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

Accepted Answer

It provides links from and to the body, allowing the CNS to receive information and make decisions.

Question 2

A patient is unable to feel pain or temperature changes on their skin but can still move their muscles. Which type of receptor is most likely damaged?

Accepted Answer

Nociceptors

Question 3

Which of the following is TRUE regarding the difference between roots and rami of spinal nerves?

Accepted Answer

Roots are medial to and form spinal nerves, each root is purely sensory or motor, while rami are distal and can carry both sensory and motor fibers.

Question 4

Which of the following cranial nerves is purely sensory?

Accepted Answer

Olfactory nerve (I)

Question 5

A person steps on a sharp object with their right foot. Which reflex is responsible for withdrawing the right leg and extending the left leg to maintain balance?

Accepted Answer

Crossed-extensor reflex

Question 6

Which of the following best describes the function of proprioceptors?

Accepted Answer

They inform the brain of the position and movement of body parts.

Question 7

If the ventral root of a spinal nerve is damaged, what would be the most likely result?

Accepted Answer

Loss of motor function in the area supplied by that nerve

Question 8

Which of the following statements about nerve plexuses is correct?

Accepted Answer

They are interlacing networks formed by ventral rami, allowing fibers from several spinal nerves to supply the same muscle.

Question 9

Which of the following is NOT a component of a reflex arc?

Accepted Answer

Cerebral cortex

Question 10

A patient has damage to the dorsal root ganglia. Which function is most likely to be impaired?

Accepted Answer

Sensory input from peripheral receptors

Question 11

Which equation best represents the pathway of a monosynaptic reflex arc?

Accepted Answer

$$	ext{Receptor} ightarrow 	ext{Sensory neuron} ightarrow 	ext{Motor neuron} ightarrow 	ext{Effector}$$

Question 12

Which of the following best explains why damage to a single spinal nerve does not usually result in complete paralysis of a limb muscle?

Accepted Answer

Nerve plexuses allow fibers from multiple spinal nerves to supply each muscle.

Question 13

Which type of nerve contains both sensory and motor fibers and transmits impulses both to and from the CNS?

Accepted Answer

Mixed nerve

Question 14

Which of the following is an example of a learned (acquired) reflex?

Accepted Answer

Driving a car and braking at a red light

Question 15

Which of the following best describes the function of the rami communicantes?

Accepted Answer

They contain autonomic nerve fibers that join ventral rami in the thoracic region.

Question 16

Which of the following is the correct order of spinal nerve branches from medial to lateral?

Accepted Answer

Rootlets → Roots → Spinal nerve → Rami

Question 17

Which of the following best describes the role of the integration center in a reflex arc?

Accepted Answer

It is the site where sensory and motor neurons synapse, and may involve interneurons.

Question 18

Which of the following is a function of the dorsal ramus of a spinal nerve?

Accepted Answer

It supplies the posterior body trunk.

Question 19

Which of the following best describes the effect of the brain on spinal reflexes?

Accepted Answer

The brain is advised of spinal reflex activity and can modify or override the reflex.

Question 20

Which of the following best describes the function of ganglia in the peripheral nervous system?

Accepted Answer

They are collections of neuron cell bodies in the PNS that serve as relay points for sensory or motor signals.

Peripheral Nervous System and Reflex Activity: Study Guide

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