DIFFUSION RATE

What is the purpose of exchange surfaces in cells?

• To prevent diffusion of molecules

• To decrease the surface area to volume ratio

• To exchange ions, gases, nutrients, and wastes with the environment

• To increase the size of the cell

How does the surface area to volume ratio change as cell size increases?

• It depends on the shape of the cell

• It decreases

• It remains constant

• It increases

Why do larger animals have special gas exchange surfaces?

• To provide more surface area for oxygen diffusion

• To increase the distance molecules have to travel to the center of the organism

• To decrease the surface area to volume ratio

• To prevent the entry of molecules into the organism

What is the biconcave shape of mammalian erythrocytes responsible for?

• Increasing the deformability of the cell

• Increasing the survival of the cell

• Decreasing the surface area to volume ratio

• Allowing more hemoglobin to be stored in the cell

What can happen if the biconcave shape of mammalian erythrocytes is disrupted?

• Anemia

• All of the above

• Sickle cell disease

• Septicemia