8.2 THE VASCULAR SYSTEM AND BLOOD FLOW

What is the main function of the vascular system?

• To transport blood
• To digest food
• To filter waste products
• To produce hormones

What is the name of the thin layer of cells that lines the inside of all vessels in the vascular system?

• Endothelium
• Myocardium
• Pericardium
• Epithelium

What is the main difference between arteries and arterioles?

• Arteries have thinner walls than arterioles
• Arteries carry oxygenated blood, while arterioles carry deoxygenated blood
• Arteries are larger in diameter than arterioles
• Arteries have no smooth muscle, while arterioles do

What is the main function of arterioles?

• To carry blood away from the heart
• To regulate blood distribution to the various tissues of the body
• To exchange gases and nutrients with the tissues
• To return blood to the heart

What controls the rings of smooth muscle in arterioles?

• Only the nervous system
• Only local chemical factors released by the tissues
• Both the nervous system and local chemical factors released by the tissues
• Neither the nervous system nor local chemical factors released by the tissues

During exercise, which of the following would happen to the arterioles that supply the muscles involved in the exercise?

• They would be constricted
• They would be relaxed
• They would not be affected
• They would be blocked completely

What is autoregulation?

• The process of the heart pumping blood
• The process of the lungs oxygenating blood
• The effects of locally produced chemical compounds on blood flow
• The process of removing waste products from the blood

What is the main function of capillaries?

• To carry blood away from the heart
• To regulate blood distribution to the various tissues of the body
• To exchange gases and nutrients with the tissues
• To return blood to the heart

What is the name of the process that occurs in the capillaries and is responsible for the exchange of gases and nutrients with the tissues?

• Active transport
• Diffusion
• Osmosis
• Filtration

How thick are the walls of capillaries?

• Very thick
• Moderately thick
• One cell thick
• Two cells thick