A sample of human blood was placed in a test tube containing a
physiological saline solution (0.9% sodium chloride). This type of solution is
often used intravenously to quickly rehydrate patients. A drop of the blood
from the test tube was placed on a slide and red blood cells (RBCS) were
observed under a microscope. Three possible outcomes are diagrammed
below. Which of the following best predicts which diagrammed
microscope view the laboratory worker would see and best explains why?
View 1 because RBC membranes are freely permeable to water
View 2 because the RBCs use energy to allow sodium entry and to pump water out
View 2 because the rate of water movement into the RBCs equa's the rate of water
movement out of the cells
Vien 3 because the sodium-potassium pumps in the RBC membranes use energy to
Veep the codum out but a water to free to the des
