Question 1

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

Accepted Answer

Positive feedback amplifies a change away from equilibrium, while negative feedback counteracts a change to maintain equilibrium.

Question 2

A patient is experiencing rapid muscle contractions due to an imbalance in sodium and potassium ions. Which type of chemical bond is primarily responsible for the formation of sodium chloride (NaCl) in the body?

Accepted Answer

Ionic bond

Question 3

Which of the following best represents the correct order of increasing levels of complexity in the human body?

Accepted Answer

Chemical → Cellular → Tissue → Organ → Organ System → Organism

Question 4

A solution with a pH of 3 is how many times more acidic than a solution with a pH of 6? Use the formula $$	ext{Difference} = 10$$^{|pH_1 - pH_2|}$$.

Accepted Answer

$$10^3 = 1000$ times more acidic

Question 5

Which of the following is NOT a function of the smooth endoplasmic reticulum (ER)?

Accepted Answer

Protein synthesis

Question 6

During which phase of mitosis do chromosomes align along the center of the cell?

Accepted Answer

Metaphase

Question 7

A scientist is studying a tissue that is composed of multiple layers of flat cells. Which tissue type is she most likely observing?

Accepted Answer

Stratified squamous epithelium

Question 8

Which of the following best describes the function of tight junctions between cells?

Accepted Answer

They prevent the passage of substances between adjacent cells.

Question 9

Which organelle is responsible for producing ATP, the main energy currency of the cell?

Accepted Answer

Mitochondrion

Question 10

A patient is diagnosed with a genetic disorder that affects the structure of collagen fibers. Which tissue type is most likely to be directly affected?

Accepted Answer

Connective tissue

Question 11

Which of the following best explains why enzymes increase the rate of chemical reactions in the body?

Accepted Answer

They lower the activation energy required for the reaction.

Question 12

Which of the following is a function of microvilli on the surface of epithelial cells in the small intestine?

Accepted Answer

Increase surface area for absorption

Question 13

A red blood cell placed in a hypotonic solution will:

Accepted Answer

Swell and possibly burst due to water entering the cell

Question 14

Which of the following best describes the process of transcription in the cell?

Accepted Answer

The synthesis of mRNA from a DNA template

Question 15

Which of the following is a characteristic of cardiac muscle tissue?

Accepted Answer

It is striated and contains intercalated discs.

Question 16

A patient with a severe burn loses the protective function of which tissue type, increasing the risk of infection?

Accepted Answer

Epithelial tissue

Question 17

Which of the following best describes the role of the basement membrane in epithelial tissue?

Accepted Answer

It anchors epithelial cells to underlying connective tissue.

Question 18

Which of the following is a major element found in the human body and is essential for the formation of hemoglobin?

Accepted Answer

Iron (Fe)

Question 19

Which of the following best describes the function of desmosomes in tissues subjected to mechanical stress, such as the skin?

Accepted Answer

They provide strong adhesion between cells to resist mechanical stress.

Question 20

A laboratory technician observes a tissue sample with cells embedded in a solid matrix containing calcium salts. Which tissue is being observed?

Accepted Answer

Compact bone

Anatomy & Physiology Study Notes: Chapters 1–4 Overview

Guida di studio - Domande di pratica

Study guide - Flashcard