Which of these is a hormone that helps to regulate red blood cell production?

Purpura is the medical term for:

a. small pinpoint hemorrhages in the eye. b. too many circulating RBCs. c. lack of iron, which is needed to manufacture hemoglobin. d. small hemorrhages in the skin.

There are __________ groups of drugs that act to lower blood pressure

Fill in the blank(s) with correct word