D2.3: Water Potential

An organ donor's heart is removed to be transplanted and is stored in an isotonic solution prior to transplant. Which of the following may result if the heart is not stored in a solution that is isotonic?

• Water will diffuse into the cardiac muscles.

• There will be no net movement of water into heart tissues.

• The heart will dry out.

• The recipient’s immune system may reject the heart.

Which statement best describes the osmotic concentration of a solution used to bathe organs for use in organ transplant procedures?

• The solution must have an osmotic concentration higher than that of the organ to be transplanted.

• The solution must have an osmotic concentration lower than that of the organ to be transplanted.

• The solution must be isotonic compared to the cells of the organ to be transplanted.

• The solution must be mixed with cells from the organ to be transplanted.

What effect on oxygen transport in a human being is likely if the individual is given a hypotonic solution intravenously?

• Oxygen transported by red blood cells will increase.

• Oxygen transported in blood plasma will increase.

• Oxygen transported in blood plasma will decrease.

• Oxygen transported by red blood cells will decrease.

Different plant tissues were placed in solutions of different sucrose concentrations, and percentage change in mass was recorded. What is the concentration of sucrose in the potato tissue?

• 0.33 μM

• 5.8 μM

• 0.53 μM

• 0.00 μM

The image below shows red blood cells placed in three different solutions as seen under the light microscope. Which type of solution were the cells shown in micrograph A most likely placed in?

• A hypertonic solution

• A hypotonic solution

• An isotonic solution

• Distilled water