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

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

d. Hemoglobin consists of two polypeptide chains bound to a heme group.

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.