Suppose your blood is AB positive. This means thata. agglutinogens A and B are present on your red blood cells,b. there are no anti-A or anti-B antibodies in your plasma,c. your blood is Rh⁺d. all of the above.

Erythropoiesis requires stimulation from the hormone:

a. thrombin.

b. thrombopoietin.

c. thymosin.

d. erythropoietin.

Fill in the blanks: Erythrocytes are derived from stem cells called____ , circulate in the blood for approximately _______days, and are destroyed by an organ called the ______ .

Platelets are derived from cells called:

a. thromboblasts.

b. leukoblasts.

c. megakaryocytes.

d. thrombokaryocytes.

Explain how blood, being a liquid, enables all its components (formed elements and plasma) to perform their functions.