Blood Vessels and Circulatory System

Which of the following is NOT a type of blood vessel in the human circulatory system?

• A) Arteries

• B) Arterioles

• C) Capillaries

• D) Neurons

What is the primary function of arteries in the circulatory system?

• Transport blood away from the heart

• Return blood to the heart

• Exchange nutrients and waste

• Store blood

How do the layers of muscle and elastic tissue in the walls of arteries help them?

• To store blood

• To withstand and maintain high blood pressure

• To exchange gases

• To prevent backflow

What is the consequence of occlusion of the coronary arteries?

• Increased blood flow

• Decreased heart rate

• Heart attack

• Improved circulation

Which of the following molecules usually can't fit through the fenestrations into the tissue fluid?

• Small ions

• Large molecules such as proteins

• Water

• Oxygen

What is the role of capillaries in relation to tissue fluid?

• Absorb tissue fluid

• Prevent tissue fluid formation

• Allow exchange of substances

• Destroy tissue fluid

What happens to the diffusion distance when capillaries are close to cells?

• A) It increases

• B) It remains the same

• C) It reduces

• D) It becomes zero.

How do arteries regulate blood pressure?

• By storing blood

• By contracting and relaxing the muscle layer

• By absorbing nutrients

• By thickening the endothelial layer

What is the function of the elastic fibers in the outer layer of arteries?

• To store blood

• To prevent the arterial wall from rupturing

• To contract and push blood

• To absorb nutrients

What is the role of vasoconstriction in arteries?

• Increases blood pressure by decreasing the diameter of the lumen

• Decreases blood pressure by increasing the diameter of the lumen

• Maintains constant blood pressure

• Has no effect on blood pressure