Q: Which equation best represents the process of sensory transduction at a sensory receptor?

$$\text{Stimulus} \rightarrow \text{Receptor Potential} \rightarrow \text{Action Potential}$$

Q: Which of the following best describes the pathway of a sensation from detection to delivery to the CNS?

$$\text{Sensory Receptor} \rightarrow \text{Peripheral Nerve} \rightarrow \text{Spinal Cord or Brainstem} \rightarrow \text{CNS}$$

Question 1

Which of the following best describes the difference between the sensory and motor divisions of the peripheral nervous system (PNS)?

Accepted Answer

The sensory division transmits impulses from sensory receptors to the CNS, while the motor division transmits impulses from the CNS to effectors.

Question 2

Which cranial nerve is responsible for transmitting visual information from the retina to the brain, and what is its classification?

Accepted Answer

Optic nerve (II); sensory

Question 3

A patient presents with loss of sensation in the anterior thigh and weakness in knee extension. Which spinal nerve plexus and specific nerve are most likely affected?

Accepted Answer

Lumbar plexus; femoral nerve

Question 4

Which of the following best describes the function of proprioceptors?

Accepted Answer

They monitor the position and movement of skeletal muscles and joints.

Question 5

Which equation best represents the process of sensory transduction at a sensory receptor?

Accepted Answer

$$	ext{Stimulus} ightarrow 	ext{Receptor Potential} ightarrow 	ext{Action Potential}$$

Question 6

Which of the following is TRUE regarding the difference between somatic motor and visceral motor (autonomic) divisions?

Accepted Answer

Somatic motor neurons control voluntary movements of skeletal muscles, while visceral motor neurons control involuntary actions of smooth muscle, cardiac muscle, and glands.

Question 7

A person touches a hot stove and immediately withdraws their hand. Which type of reflex is this, and which receptor initiates it?

Accepted Answer

Polysynaptic reflex; nociceptor

Question 8

Which of the following best describes the pathway of a sensation from detection to delivery to the CNS?

Accepted Answer

$$	ext{Sensory Receptor} ightarrow 	ext{Peripheral Nerve} ightarrow 	ext{Spinal Cord or Brainstem} ightarrow 	ext{CNS}$$

Question 9

Which cranial nerve is responsible for innervating most of the muscles of facial expression, and what is its classification?

Accepted Answer

Facial nerve (VII); mixed

Question 10

Which of the following best describes the difference between upper motor neurons and lower motor neurons?

Accepted Answer

Upper motor neurons originate in the cerebral cortex or brainstem and synapse onto lower motor neurons, which then innervate skeletal muscles.

Question 11

Which of the following is NOT a function of the brachial plexus?

Accepted Answer

Innervation of the diaphragm via the phrenic nerve

Question 12

A patient is unable to abduct their arm at the shoulder and has numbness over the deltoid region. Which nerve is most likely damaged?

Accepted Answer

Axillary nerve

Question 13

Which of the following best describes a monosynaptic reflex?

Accepted Answer

A reflex involving only one synapse between a sensory and a motor neuron

Question 14

Which receptor type is primarily responsible for detecting changes in blood pH?

Accepted Answer

Chemoreceptor

Question 15

Which of the following best describes the role of stretch receptors in skeletal muscles?

Accepted Answer

They detect changes in muscle length and initiate reflexes to maintain muscle tone.

Question 16

Which spinal nerve plexus gives rise to the sciatic nerve, and what is the primary function of this nerve?

Accepted Answer

Sacral plexus; innervates the posterior thigh and most of the leg and foot

Question 17

A patient has difficulty swallowing and a hoarse voice. Damage to which cranial nerve is most likely responsible?

Accepted Answer

Vagus nerve (X)

Question 18

Which of the following best describes a crossed-extension reflex?

Accepted Answer

A reflex that causes the opposite limb to extend when the other limb withdraws from a painful stimulus

Question 19

Which of the following is a correct sequence for the components of a reflex arc?

Accepted Answer

$$	ext{Receptor} ightarrow 	ext{Sensory Neuron} ightarrow 	ext{Integration Center} ightarrow 	ext{Motor Neuron} ightarrow 	ext{Effector}$$

Question 20

Which cranial nerve is responsible for the sense of smell, and where are its nuclei located?

Accepted Answer

Olfactory nerve (I); olfactory bulb

Biol 223 Ch 13 Instructor Guide

Study Guide - Practice Questions

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