Question

Which of the following examples illustrates osmosis?

a. .Water leaves the tubules of the kidney in response to the hypertonic fluid surrounding the tubules.
b. .Digestive enzymes are excreted into the small intestine.
c. .White blood cells consume pathogens and cell debris at the site of an infection.
d. .Calcium is pumped inside a muscle cell after the muscle completes its contraction.

Answer 1

The correct example of osmosis is a. Water leaves the tubules of the kidney in response to the hypertonic fluid surrounding the tubules. Osmosis is the passive diffusion of water across a semipermeable membrane from a region of high water concentration to low concentration.

Step-by-step explanation:

The example that illustrates osmosis is:

• a. Water leaves the tubules of the kidney in response to the hypertonic fluid surrounding the tubules.

Osmosis is the diffusion of water across a semipermeable membrane from an area of higher water concentration to one of lower water concentration. When the fluid surrounding the kidney tubules is hypertonic, it means it has a higher solute concentration compared to inside the tubules. As a result, water tends to move out of the cell into the surrounding fluid until an isotonic state is achieved. In contrast, osmosis does not apply to scenarios where cells or substances move against the concentration gradient as this requires energy in the form of ATP, a process known as active transport. Examples b, c, and d involve processes other than osmosis.

Answer 2

An example of osmosis is when the water leaves the tubules of the kidney in response to the hypertonic fluid surrounding the tubules. Osmosis in the kidneys is a filtration. Osmosis will filter the water molecules and solutes in the kidneys from the plasma to the tubule. The other choices given are not an example of osmosis. The correct answer to this question is A.