Question 1

Which of the following best describes the concept of homeostasis in human physiology?

Accepted Answer

The process by which the body maintains a stable internal environment despite external changes.

Question 2

A patient is experiencing muscle fatigue during intense exercise. Which metabolic pathway is primarily responsible for energy production under these anaerobic conditions?

Accepted Answer

Anaerobic glycolysis

Question 3

Which of the following equations correctly represents the breakdown of glucose during anaerobic metabolism?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} \rightarrow 2\ \mathrm{C_3H_6O_3} + 2\ \mathrm{ATP}$$

Question 4

Which neurotransmitter is most commonly associated with the neuromuscular junction and muscle contraction?

Accepted Answer

Acetylcholine

Question 5

A person is exposed to a cold environment. Which physiological response best illustrates negative feedback in thermoregulation?

Accepted Answer

Shivering to increase body temperature

Question 6

Which of the following best describes the role of enzymes in metabolic reactions?

Accepted Answer

They lower the activation energy required for reactions to proceed.

Question 7

A patient with a spinal cord injury cannot feel or move their legs. Which division of the nervous system is most likely affected?

Accepted Answer

Central nervous system

Question 8

Which of the following is a correct sequence of events in synaptic transmission at a chemical synapse?

Accepted Answer

Action potential arrives, calcium influx, neurotransmitter release, postsynaptic receptor activation

Question 9

Which of the following best explains why aerobic metabolism is more efficient than anaerobic metabolism?

Accepted Answer

Aerobic metabolism produces more ATP per glucose molecule.

Question 10

A student is asked to calculate the net ATP yield from the complete aerobic oxidation of one glucose molecule. Which equation should they use?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} \rightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O} + 36\ \mathrm{ATP}$$

Question 11

Which of the following best describes the function of the myelin sheath in the nervous system?

Accepted Answer

It increases the speed of action potential conduction along the axon.

Question 12

A person touches a hot stove and quickly withdraws their hand. Which type of neural circuit is primarily responsible for this rapid response?

Accepted Answer

Reflex arc

Question 13

Which of the following is a direct effect of sympathetic nervous system activation during the 'fight or flight' response?

Accepted Answer

Increased heart rate

Question 14

Which of the following best explains why neurons are considered excitable cells?

Accepted Answer

They can generate and propagate electrical signals called action potentials.

Question 15

A patient is unable to remember recent events but can recall events from years ago. Which brain region is most likely affected?

Accepted Answer

Hippocampus

Question 16

Which of the following best describes the function of chemical messengers known as neurotransmitters?

Accepted Answer

They transmit signals across synapses between neurons.

Question 17

Which of the following is an example of a positive feedback mechanism in human physiology?

Accepted Answer

Release of oxytocin during childbirth to intensify uterine contractions

Question 18

A person is running a marathon and begins to experience muscle cramps due to lactic acid buildup. Which metabolic process is responsible for this phenomenon?

Accepted Answer

Anaerobic glycolysis

Question 19

Which of the following best describes the role of the sodium-potassium pump ($$\mathrm{Na^+/K^+}$$ ATPase) in neurons?

Accepted Answer

It maintains the resting membrane potential by moving $$3\ \mathrm{Na^+}$$ out and $$2\ \mathrm{K^+} in $$per ATP hydrolyzed.

Question 20

A patient presents with muscle weakness and fatigue. Laboratory tests reveal a deficiency in acetylcholine receptors at the neuromuscular junction. Which condition is most consistent with these findings?

Accepted Answer

Myasthenia gravis

Anatomy & Physiology Course Syllabus and Weekly Topics Overview

Study Guide - Practice Questions

Study Guide - Flashcards