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 weakness and irregular heartbeats. Blood tests reveal low potassium ion ($$K^+) $$levels. Which function of $$K^+ is $$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

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 body?

Accepted Answer

Water molecules form hydrogen bonds with each other, requiring more energy to change temperature.

Question 6

A patient with a severe burn covering a large area of the body is at risk for life-threatening complications primarily because:

Accepted Answer

The skin loses its ability to regulate body temperature and prevent fluid loss.

Question 7

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 8

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

Accepted Answer

It uses ATP to move sodium ions out of the cell and potassium ions into the cell, maintaining their 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

The polar heads are hydrophilic and face water, while the nonpolar tails are hydrophobic and face each other.

Question 11

A patient 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 precursor required for calcium absorption

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 water molecule

Question 13

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

Accepted Answer

Phagocytosis

Question 14

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

Accepted Answer

Enzymes lower the activation energy and speed up chemical reactions without being consumed.

Question 15

A patient has a genetic mutation that prevents the formation of desmosomes in their skin cells. Which of the following symptoms would most likely result?

Accepted Answer

Skin cells easily separate and tear apart under stress

Question 16

Which of the following best describes the difference between primary and secondary active transport?

Accepted Answer

Primary active transport uses ATP directly, while secondary active transport uses the energy stored in a concentration gradient created by primary active transport.

Question 17

A patient is diagnosed with a disease that destroys the myelin sheath of neurons, impairing nerve impulse conduction. Which organ system is primarily affected?

Accepted Answer

Nervous system

Question 18

Which of the following best describes the function of the Golgi apparatus in a cell?

Accepted Answer

Modifies, concentrates, and packages proteins and lipids for secretion or use within the cell

Question 19

A tissue sample is found to contain a large amount of extracellular matrix with collagen fibers and very few cells. Which type of tissue is this most likely to be?

Accepted Answer

Connective tissue

Question 20

A patient with a genetic disorder cannot produce the enzyme catalase in their peroxisomes. Which of the following would most likely accumulate in their cells as a result?

Accepted Answer

Hydrogen peroxide ($$H_2O_2)$$

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

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