Chap 15

In mitral valve prolapse, the mitral valve

• is missing as a result of abnormal development

• has an extra cusp.

• bulges into the left atrium during ventricular relaxation.

• bulges into the left atrium during ventricular contraction.

What prevents blood from flowing back into the atria when the ventricles contract?

• semilunar valves

• sinoatrial node

• atrioventricular node

• tricuspid and bicuspid valves

When blood leaves this chamber of the heart, it heads out to the body (not the lungs)

• left atrium

• right atrium

• left ventricle

• right ventricle

One of the body's largest blood vessels that transports blood from the body region below the diaphragm to the heart

• superior vena cava

• inferior vena cava

• pulmonary trunk

• pulmonary veins

When this chamber contracts, it pushes blood through the tricuspid valve

• right atria

• right ventricle

• left atria

• left ventricle

These are the smallest blood vessels with the thinnest walls in order to maximize diffusion of nutrients in and out of the interstitial fluid

• arteries

• veins

• capillaries

• aorta

Which best explains why capillary walls are so thin?

• because they do not need to pump blood

• because they are found only in the smallest organs and tissues

• because they maximize diffusion of nutrients

• because blood only travels through them slowly

These carry blood away from the heart

• Arteries

• Veins

These carry blood towards the heart

• arteries

• veins

Blood traveling through the pulmonary circuit goes through the right side of the heart and out to the _______

• left side of the heart

• body

• lungs

• tricuspid valve