Question 1

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

Accepted Answer

The maintenance of a stable internal environment through negative and positive feedback mechanisms.

Question 2

A patient presents with a blood pH of 7.1. Which of the following best describes their condition, and what physiological mechanism is most likely to respond?

Accepted Answer

The patient is experiencing acidosis, and the buffer systems in the blood will attempt to restore pH to normal.

Question 3

Which of the following correctly matches a cellular organelle with its primary function?

Accepted Answer

Mitochondria: ATP production through aerobic respiration

Question 4

A red blood cell is placed in a hypotonic solution. What will happen to the cell, and which process is responsible?

Accepted Answer

The cell will swell and possibly burst due to osmosis.

Question 5

Which of the following is a correct sequence of events in the transmission of a nerve impulse across a chemical synapse?

Accepted Answer

Action potential arrives at axon terminal → Calcium ions enter → Neurotransmitter released → Neurotransmitter binds to postsynaptic receptor

Question 6

Which of the following best explains why the resting membrane potential of a neuron is typically around $$-70\ \mathrm{mV}$$?

Accepted Answer

There is a higher permeability to $$\mathrm{K}^+$$ ions than $$\mathrm{Na}^+$$ ions due to leak channels.

Question 7

A patient has a mutation that prevents the formation of gap junctions in cardiac muscle. Which of the following physiological effects would most likely occur?

Accepted Answer

Impaired electrical conduction between cardiac muscle cells, leading to arrhythmias.

Question 8

Which of the following best describes the difference between peptide and steroid hormones in their mechanism of action?

Accepted Answer

Peptide hormones bind to cell surface receptors and activate second messengers, while steroid hormones diffuse through the membrane and bind to intracellular receptors.

Question 9

Which of the following is a function of the integumentary system that directly contributes to homeostasis?

Accepted Answer

Regulation of body temperature through sweat gland activity

Question 10

A patient is unable to produce sufficient parathyroid hormone (PTH). Which of the following would most likely be observed in their blood calcium levels?

Accepted Answer

Decreased blood calcium due to reduced bone resorption

Question 11

Which of the following best describes the process of endochondral ossification?

Accepted Answer

Bone forms by replacing hyaline cartilage with osseous tissue.

Question 12

Which of the following is a correct pairing of a synovial joint type and its movement?

Accepted Answer

Ball-and-socket joint: triaxial movement

Question 13

During muscle contraction, which of the following events occurs according to the sliding filament theory?

Accepted Answer

The sarcomere shortens as actin and myosin filaments slide past each other.

Question 14

Which of the following best explains why a person with damage to the cerebellum may have difficulty with balance and coordination?

Accepted Answer

The cerebellum integrates sensory input and coordinates voluntary motor activity.

Question 15

A patient is exposed to a toxin that blocks voltage-gated sodium channels in neurons. What is the most immediate effect on neuronal function?

Accepted Answer

Action potentials cannot be generated, leading to loss of nerve signaling.

Question 16

Which of the following best describes the role of the sodium-potassium pump in maintaining the resting membrane potential?

Accepted Answer

It moves $$3\ \mathrm{Na}^+$$ ions out of the cell and $$2\ \mathrm{K}^+$$ ions into the cell, using ATP.

Question 17

Which of the following is a correct description of the difference between the central nervous system (CNS) and the peripheral nervous system (PNS)?

Accepted Answer

The CNS consists of the brain and spinal cord, while the PNS includes all neural tissue outside the CNS.

Question 18

A person is exposed to a cold environment and begins to shiver. Which type of feedback loop is responsible for this response, and what is the outcome?

Accepted Answer

Negative feedback; body temperature returns toward normal.

Question 19

Which of the following best describes the function of the sarcoplasmic reticulum in skeletal muscle fibers?

Accepted Answer

It stores and releases calcium ions necessary for muscle contraction.

Anatomy and Physiology I (BIOL-109) Course Syllabus and Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards