Question 1

Which of the following best illustrates the principle of complementarity of structure and function in human anatomy?

Accepted Answer

The heart's muscular walls allow it to pump blood throughout the body.

Question 2

A patient is experiencing muscle cramps and irregular heartbeats. Blood tests reveal a significant decrease in potassium ion concentration. Which function of potassium ions is most directly related to these symptoms?

Accepted Answer

Conduction of nerve impulses and muscle contraction

Question 3

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

Accepted Answer

Regulation of blood glucose levels by insulin and glucagon

Question 4

A cell is placed in a solution and water moves into the cell, causing it to swell. Which transport process is responsible for this movement?

Accepted Answer

Osmosis

Question 5

Which of the following best explains why water has a high heat capacity and is important for temperature regulation in the human body?

Accepted Answer

Hydrogen bonding between water molecules allows water to absorb and release large amounts of heat with little temperature change.

Question 6

A patient with a genetic mutation cannot produce enough lysosomal enzymes. Which cellular process would be most directly affected?

Accepted Answer

Intracellular digestion of worn-out organelles

Question 7

Which of the following best describes the difference between simple diffusion and facilitated diffusion across the plasma membrane?

Accepted Answer

Simple diffusion moves substances directly through the lipid bilayer, while facilitated diffusion requires membrane proteins.

Question 8

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

Accepted Answer

It uses ATP to move $$3 \ \mathrm{Na}^+$$ out of the cell and $$2 \ \mathrm{K}^+$$ into the cell, maintaining concentration gradients.

Question 9

A scientist is studying a tissue that is avascular, has tightly packed cells, and lines the inside of the stomach. Which tissue type is being studied?

Accepted Answer

Epithelial tissue

Question 10

Which of the following best explains why phospholipids form a bilayer in the plasma membrane?

Accepted Answer

Phospholipids have hydrophilic heads that face water and hydrophobic tails that avoid water, causing them to arrange in a bilayer.

Question 11

A patient has a burn that destroys the entire epidermis and dermis, appears gray-white, and is not painful. Which type of burn does this patient have?

Accepted Answer

Third-degree (full-thickness) burn

Question 12

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

Accepted Answer

Joining two monomers to form a polymer by removing a molecule of water: $$	ext{Monomer}_1 + 	ext{Monomer}_2 ightarrow 	ext{Polymer} + \mathrm{H}_2\mathrm{O}$$

Question 13

A person is unable to absorb calcium from their diet, leading to weakened bones. Which function of the skin is most directly related to this problem?

Accepted Answer

Synthesis of vitamin D, which is required for calcium absorption

Question 14

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA is double-stranded and contains deoxyribose; RNA is single-stranded and contains ribose.

Question 15

A patient is diagnosed with a disease that prevents the formation of collagen fibers. Which tissue type would be most directly affected?

Accepted Answer

Connective tissue

Question 16

Which of the following best describes the function of serous membranes in the ventral body cavity?

Accepted Answer

They produce a lubricating fluid that reduces friction between moving organs.

Question 17

A cell is observed to engulf a bacterium by extending its plasma membrane around the bacterium and internalizing it. Which process is being described?

Accepted Answer

Phagocytosis

Question 18

Which of the following best explains why chemical reactions in the body are often irreversible?

Accepted Answer

Products are removed from the reaction site or used in other reactions, preventing the reverse reaction.

Question 19

A person is exposed to a cold environment. Which physiological response is most likely to occur to help maintain homeostasis?

Accepted Answer

Constriction of dermal blood vessels to reduce heat loss

Question 20

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

Accepted Answer

They lower the activation energy required for a reaction to occur: $$E_a \downarrow$$

Exam 1 Review: Human Body Orientation, Chemistry, Cells, and Tissues

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