Question 1

Which of the following best describes the difference between afferent and efferent pathways in the peripheral nervous system?

Accepted Answer

Afferent pathways carry sensory information toward the CNS, while efferent pathways carry motor commands away from the CNS.

Question 2

A patient presents with loss of sensation in the lateral forearm and weakness in elbow flexion. Which brachial plexus nerve is most likely affected?

Accepted Answer

Musculocutaneous nerve

Question 3

Which of the following spinal nerve components contains only sensory fibers?

Accepted Answer

Dorsal root

Question 4

A patient is unable to withdraw their hand from a painful stimulus. Which spinal reflex is most likely impaired?

Accepted Answer

Withdrawal (flexor) reflex

Question 5

Which equation best represents the process of accommodation in the eye?

Accepted Answer

$$P = \frac{1}{f}$$, where P is the power of the lens and f is the focal length

Question 6

Which sensory receptor type adapts rapidly to a constant stimulus, allowing you to stop noticing your clothes after putting them on?

Accepted Answer

Phasic mechanoreceptors

Question 7

Which cranial nerve is responsible for transmitting auditory information from the cochlea to the brain?

Accepted Answer

CN VIII (Vestibulocochlear nerve)

Question 8

Which of the following best describes the difference between the sympathetic and parasympathetic divisions of the autonomic nervous system?

Accepted Answer

Sympathetic division has short preganglionic and long postganglionic fibers, while parasympathetic has long preganglionic and short postganglionic fibers.

Question 9

Which of the following is a cholinergic receptor found at the neuromuscular junction?

Accepted Answer

Nicotinic receptor

Question 10

A patient with damage to the ventral root of a spinal nerve would most likely experience which of the following?

Accepted Answer

Loss of motor function in the affected area

Question 11

Which of the following best explains the concept of dual innervation in the autonomic nervous system?

Accepted Answer

Organs receive input from both sympathetic and parasympathetic divisions, allowing for precise regulation.

Question 12

Which of the following equations best represents the effect of insulin on blood glucose levels?

Accepted Answer

$$\Delta [Glucose] = -k \cdot [Insulin]$$

Question 13

Which of the following is an example of a second messenger system in hormone action?

Accepted Answer

cAMP activation following hormone-receptor binding

Question 14

Which of the following best describes the process of up-regulation in hormone receptor activity?

Accepted Answer

Increase in the number of receptors in response to low hormone levels

Question 15

Which structure in the ear is responsible for detecting rotational movement of the head?

Accepted Answer

Semicircular canals

Question 16

Which of the following is true regarding short and long visceral reflexes in the autonomic nervous system?

Accepted Answer

Short reflexes bypass the CNS and are mediated by local ganglia, while long reflexes involve the CNS.

Question 17

Which hormone is secreted by the pancreas and acts to lower blood glucose levels?

Accepted Answer

Insulin

Question 18

Which of the following best describes the hypophyseal portal system?

Accepted Answer

A network of capillaries connecting the hypothalamus to the anterior pituitary, allowing direct hormone transport

Question 19

A patient with improper regulation of tropic hormones may experience which of the following?

Accepted Answer

Abnormal growth or function of target endocrine glands

Unit 4 Study Guide: Peripheral Nervous System, Autonomic Nervous System, and Endocrine System

Guida di studio - Domande di pratica

Study guide - Flashcard