Question 1

Which of the following best describes osmosis in the context of cell physiology?

Accepted Answer

The movement of water molecules from an area of low solute concentration to high solute concentration across a semipermeable membrane.

Question 2

A red blood cell is placed in a hypotonic solution. What is most likely to happen to the cell?

Accepted Answer

It will swell and possibly burst due to water entering the cell.

Question 3

A patient receives an intravenous solution that is hypertonic compared to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

The cells will shrink due to water leaving the cells.

Question 4

Which of the following best explains why isotonic solutions are used for intravenous infusions?

Accepted Answer

They prevent water from entering or leaving the cells, maintaining cell volume.

Question 5

A cell is placed in a solution with 5% NaCl. The cytoplasm of the cell contains 0.9% NaCl. What type of solution is the cell in, and what will happen?

Accepted Answer

The solution is hypertonic; the cell will shrink.

Question 6

Which process is most directly responsible for muscle contraction at the cellular level?

Accepted Answer

Active transport of calcium ions into the sarcoplasmic reticulum.

Question 7

If a cell is placed in a solution and water moves out of the cell, what can be inferred about the tonicity of the solution?

Accepted Answer

The solution is hypertonic compared to the cell.

Question 8

Which of the following is a defining characteristic of facilitated diffusion?

Accepted Answer

It uses membrane proteins to move molecules down their concentration gradient.

Question 9

A cell is placed in a solution and neither swells nor shrinks. What is the best explanation for this observation?

Accepted Answer

The solution is isotonic to the cell.

Question 10

Which of the following best describes the role of the sodium-potassium pump in maintaining cell homeostasis?

Accepted Answer

It actively transports sodium out of the cell and potassium into the cell using ATP.

Question 11

A muscle cell is exposed to a solution with a lower concentration of solutes than its cytoplasm. What is the expected effect?

Accepted Answer

Water will move into the cell, causing it to swell.

Question 12

Which of the following is NOT a consequence of placing a cell in a hypertonic solution?

Accepted Answer

Cell swelling due to water gain.

Question 13

Which of the following statements about ionic solutions is correct?

Accepted Answer

Ionic solutions conduct electricity due to the presence of charged particles.

Question 14

A cell membrane is selectively permeable. Which of the following best describes this property?

Accepted Answer

It allows certain molecules to pass while restricting others.

Question 15

Which of the following scenarios best illustrates the concept of diffusion?

Accepted Answer

Oxygen molecules moving from the alveoli into the blood due to concentration differences.

Question 16

Which of the following is a real-life application of osmosis in medicine?

Accepted Answer

Dialysis treatment for kidney failure, where waste products are removed from blood via osmosis.

Osmosis and Tonicity: Principles and Applications in Anatomy & Physiology

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