Question 1

Which of the following best describes a negative feedback system in the human body?

Accepted Answer

A process that reverses the direction of the original stimulus, helping maintain homeostasis.

Question 2

Which of the following is the correct order of structural organization in the human body, from simplest to most complex?

Accepted Answer

Molecule, cell, tissue, organ, organ system, organism

Question 3

A patient is given intravenous fluids that are hypotonic compared to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

Red blood cells will swell and may burst due to water entering the cell.

Question 4

Which equation correctly represents the relationship between hydrogen ion concentration and pH?

Accepted Answer

$$\mathrm{pH} = -\log_{10}[\mathrm{H}^+]$$

Question 5

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

Accepted Answer

Enzymes lower the activation energy required for the reaction.

Question 6

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-4}$$ M. What is its pH?

Accepted Answer

$$4$$

Question 7

Which of the following is a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between atoms.

Question 8

During osmosis, water moves across a semipermeable membrane. In which direction does water flow?

Accepted Answer

From an area of lower solute concentration to an area of higher solute concentration.

Question 9

Which of the following best describes the difference between active and passive transport across cell membranes?

Accepted Answer

Active transport requires energy, while passive transport does not.

Question 10

Which type of epithelial tissue is best suited for diffusion and filtration?

Accepted Answer

Simple squamous epithelium

Question 11

Which of the following is a function of the smooth muscle tissue?

Accepted Answer

Movement of food through the digestive tract

Question 12

Which statement about DNA and RNA is correct?

Accepted Answer

DNA is double-stranded, while RNA is usually single-stranded.

Question 13

Which of the following best describes the process of transcription?

Accepted Answer

The synthesis of RNA from a DNA template.

Question 14

Which of the following is true about exocrine glands?

Accepted Answer

They release their secretions through ducts to an epithelial surface.

Question 15

Which tissue type is most likely to heal by regeneration after injury?

Accepted Answer

Epithelial tissue

Question 16

Which of the following is a correct example of a redox (oxidation-reduction) reaction?

Accepted Answer

Glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6) $$being converted to carbon dioxide ($$\mathrm{CO}_2) $$and water ($$\mathrm{H}_2\mathrm{O}) $$during cellular respiration

Question 17

Which of the following best describes the hydrophobic region of a cell membrane?

Accepted Answer

It consists of fatty acid tails that repel water.

Question 18

Which of the following is NOT a function of epithelial tissue?

Accepted Answer

Contraction

Question 19

Which of the following best describes the difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands secrete hormones directly into the bloodstream; exocrine glands secrete through ducts to surfaces.

Question 20

Which of the following best explains why water is able to dissolve ionic compounds?

Accepted Answer

Water is polar, allowing it to surround and separate positive and negative ions.

Anatomy & Physiology Study Guide: Key Concepts and Review

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