Question 1

Which of the following best describes the role of the sodium-potassium pump ($Na^+/K^+$ ATPase) in maintaining the resting membrane potential of a neuron?

Accepted Answer

It actively transports $3$ $Na^+$ ions out and $2$ $K^+$ ions into the cell, creating an electrochemical gradient.

Question 2

A patient presents with muscle weakness and fatigue. Laboratory tests reveal low acetylcholine levels at the neuromuscular junction. Which process is most likely impaired?

Accepted Answer

Release of neurotransmitters from the presynaptic neuron.

Question 3

Which of the following best explains why the blood-brain barrier is essential for proper neural function?

Accepted Answer

It restricts passage of harmful substances while allowing selective transport of essential molecules.

Question 4

Which hormone is released by the posterior pituitary and is responsible for water reabsorption in the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 5

A person touches a hot stove and immediately withdraws their hand. Which neural pathway is primarily responsible for this rapid response?

Accepted Answer

Somatic reflex arc

Question 6

Which of the following best describes the function of ligand-gated ion channels in synaptic transmission?

Accepted Answer

They open when specific neurotransmitters bind, allowing ions to flow across the membrane.

Question 7

Which of the following is a graded potential rather than an action potential?

Accepted Answer

A depolarization that decreases in magnitude as it spreads from the site of stimulation.

Question 8

Which structure in the ear is primarily responsible for detecting rotational movement and maintaining balance?

Accepted Answer

Vestibular apparatus

Question 9

A patient with diabetes mellitus has elevated blood glucose levels. Which hormone is most directly responsible for lowering blood glucose?

Accepted Answer

Insulin

Question 10

Which of the following best describes the role of G-protein coupled receptors (GPCRs) in cellular signaling?

Accepted Answer

They activate intracellular signaling cascades via G-proteins when a ligand binds.

Question 11

Which of the following scenarios best illustrates the concept of sensory adaptation?

Accepted Answer

A person no longer notices the feeling of their watch on their wrist after wearing it for several hours.

Question 12

Which neurotransmitter is primarily involved in the regulation of mood and is often targeted by antidepressant medications?

Accepted Answer

Serotonin

Question 13

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

Accepted Answer

Afferent pathways carry sensory information to the central nervous system; efferent pathways carry motor commands away from the central nervous system.

Question 14

Which of the following is a function of the hypothalamus?

Accepted Answer

Control of hormone release from the pituitary gland

Question 15

A patient is unable to distinguish between sweet and salty tastes. Which cranial nerve is most likely affected?

Accepted Answer

Facial nerve (CN VII)

Question 16

Which of the following best describes the process of synaptic transmission at a chemical synapse?

Accepted Answer

Neurotransmitters are released from the presynaptic neuron and bind to receptors on the postsynaptic neuron.

Question 17

Which of the following is a real-life example of a negative feedback mechanism in human physiology?

Accepted Answer

Regulation of blood glucose by insulin and glucagon.

Question 18

Which of the following best explains why myelination increases the speed of action potential conduction along an axon?

Accepted Answer

Myelin insulates the axon, enabling saltatory conduction between nodes of Ranvier.

Question 19

A patient with damage to the parietal lobe of the brain is most likely to experience deficits in which function?

Accepted Answer

Somatosensory perception (touch, pain, temperature)

Fundamental Terms and Concepts in Anatomy & Physiology: Nervous and Endocrine Systems

Study Guide - Practice Questions

Study Guide - Flashcards