capillaries and tissue fluid

Which aspect of capillaries increases their surface area for exchange?

• There walls are made up of a single layer of cells

• They have a very small lumen

• There many of them and they are very small

A function of the capillaries is:

• They carry blood away from the heart

• They are a site for exchange of substances from the blood to the cells, and vice versa

• The carry blood to the heart

Which end of a capillary has the greatest hydrostatic pressure?

• Arterial end (the end coming from the arteries)

• Venous end (the end coming from the veins)

• It is equal throughout

What is the difference between blood plasma and tissue fluid?

• Its contents

• Its location (in the capilary or around the cells)

• Its pressure

What causes blood plasma to become tissue fluid?

• Hydrostatic pressure forces it out of the arterial end of the capillary

• Hydrostatic pressure forces it out of the venous end of the capillary

• High water potential in the capillary relative to tissues causes osmosis

• Low water potential in the capillary relative to tissues causes osmosis

At which end of the capillary is tissue fluid reabsorbed?

• Arterial end

• Venous end

What causes the reabsorption of tissue fluid?

• High hydrostatic pressure at the arterial end

• High hydrostatic pressure at the venous end

• High water potential around the cells and low water potential in the capillary, leading to osmosis

• Low water potential around the cells and high water potential in the capillary, leading to osmosis

What happens to tissue fluid that is not reabsorbed back into the capillaries?

• It stays in the tissues and causes swelling

• It is absorbed by lymph vessels and returned to the blood

• It is eventually reabsorbed by the capillary

Which substances must leave the blood to enter the cells? (Tick ALL the correct answers)

• Oxygen

• Glucose

• Amino acids

• Urea

• Carbon dioxide

Which substances must leave the cells to enter the blood? (Tick ALL the correct answers)

• Oxygen

• Glucose

• Amino acids

• Urea

• Carbon dioxide