Question 1

Which of the following best describes the difference between negative and positive feedback mechanisms in homeostasis?

Accepted Answer

Negative feedback opposes the original stimulus to maintain stability, while positive feedback amplifies the stimulus to drive a process to completion.

Question 2

A patient presents with a blood pH of 7.1. Which of the following best describes their condition, and what is the normal range for blood pH?

Accepted Answer

The patient is experiencing acidosis; normal blood pH is 7.35–7.45.

Question 3

Which of the following best describes the process of dehydration synthesis?

Accepted Answer

It forms polymers from monomers by removing a molecule of water.

Question 4

A cell is placed in a hypertonic solution. Which of the following will most likely occur?

Accepted Answer

Water will move out of the cell, causing it to shrink.

Question 5

Which organelle is primarily responsible for the production of ATP through aerobic respiration?

Accepted Answer

Mitochondrion

Question 6

Which tissue type is specialized for rapid communication and control of body functions?

Accepted Answer

Nervous tissue

Question 7

A patient suffers a deep cut that damages the reticular layer of the dermis. Which accessory structures are most likely to be affected?

Accepted Answer

Sweat glands and hair follicles

Question 8

During an action potential, which event is responsible for the rapid depolarization phase?

Accepted Answer

Opening of voltage-gated sodium channels

Question 9

Which of the following best describes the role of the cerebellum?

Accepted Answer

Coordinates voluntary movements and maintains posture and balance

Question 10

A patient is unable to feel pain or temperature on the left side of their body below the neck. Which spinal cord tract is most likely damaged?

Accepted Answer

Right spinothalamic tract

Question 11

Which cranial nerve is responsible for the sense of smell?

Accepted Answer

Olfactory nerve (I)

Question 12

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

Accepted Answer

Sympathetic division increases heart rate and dilates pupils; parasympathetic division decreases heart rate and constricts pupils.

Question 13

Which hormone is released in response to high blood osmolarity and acts to conserve water in the kidneys?

Accepted Answer

Antidiuretic hormone (ADH)

Question 14

Which of the following is a characteristic of steroid hormones compared to amino acid-based hormones?

Accepted Answer

Steroid hormones are lipid-soluble and can cross the plasma membrane to bind intracellular receptors.

Question 15

Which process is responsible for the formation of most bones in the human body, such as the femur?

Accepted Answer

Endochondral ossification

Question 16

A synovial joint that allows movement in only one plane, such as the elbow, is classified as which type of joint?

Accepted Answer

Hinge joint

Question 17

Which of the following best describes the role of calcium ions ($$\mathrm{Ca$$^{2+}$$}) in $$skeletal muscle contraction?

Accepted Answer

They bind to troponin, causing a conformational change that exposes myosin-binding sites on actin.

Question 18

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

Question 19

Which of the following best explains why enzymes are considered biological catalysts?

Accepted Answer

They lower the activation energy, increasing the rate of chemical reactions without being consumed.

Question 20

Which of the following is the correct sequence of events for the propagation of an action potential along a myelinated axon?

Accepted Answer

Saltatory conduction, with action potentials jumping from one node of Ranvier to the next

BIOLOGY 109: Comprehensive Study Guide for Anatomy and Physiology

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