Cardiovascular Physiology Quiz

What is the primary role of capillaries?

• Transport oxygen

• Exchange substances between blood and tissues

• Store blood

• Regulate blood pressure

What type of capillaries have no fenestrations?

• Sinusoidal capillaries

• Fenestrated capillaries

• Continuous capillaries

• Discontinuous capillaries

Which cells are involved in the function of capillaries?

• Neurons

• Fibroblasts

• Endothelial cells

• Erythrocytes

What is the main factor that limits the size of molecules passing through capillaries?

• Hydrostatic pressure

• Size of fenestrations

• Osmotic pressure

• Blood viscosity

What is the role of pericytes in capillaries?

• Transport oxygen

• Increase blood flow

• Regulate capillary diameter and flow

• Produce collagen

What does histamine do to capillary permeability?

• Clogs capillaries

• Has no effect

• Increases permeability

• Decreases permeability

What is colloid osmotic pressure primarily exerted by?

• Lipids

• Proteins

• Electrolytes

• Water

What happens when filtration exceeds reabsorption in capillaries?

• Increased blood pressure

• Edema

• Dehydration

• Vasoconstriction

What is the primary function of the venous system?

• Transport oxygen

• Store blood

• Filter blood

• Return blood to the heart

What percentage of blood volume do veins contain?

• 50%

• 40%

• 30%

• 60%