Chapter 20, Problem 28RQ

How does the delay of the impulse at the atrioventricular node contribute to cardiac function?

State the main functions of venules and veins. What forces work together in returning venous blood to the heart?

A patient suffering from hypertension may receive drugs that decrease the hearts output, dilate arterioles, or increase urine production. In each case, how would the drug treatment help relieve hypertension?