What signal causes the heart to secrete atrial natriuretic hormone? a. increased blood pressure b. decreased blood pressure c. increased $Na^+$ levels d. decreased $Na^+$ levels

What hormone directly opposes the actions of natriuretic hormones? a. renin b. nitric oxide c. dopamine d. aldosterone

For each of the following hormones—epinephrine, renin, angiotensin II, aldosterone, ADH, and atrial natriuretic hormone—state where each is produced, what stimulus causes increased hormone production, and the hormone’s effect on the circulatory system.