What vessels return blood to the heart from the lungs?

Prolactin stimulates milk production.

Which statement is true about coronary circulation?

Name one location where capillaries are not found.

How do sugars and amino acids pass in and out of capillaries? (Mark all that apply.)

The semilunar valves occur between ventricles and arteries.

Lacteals contain a special type of lymph called

What structure attaches to the flaps of valves to prevent them from turning inside out?

Name one catecholamine.

Polycythemia causes the blood to be too thin.