21) An immature RBC which contains some endoplasmic reticulum is called a:

A) megakaryocyte

B) hemocytoblast

C) reticulocyte

D) agranulocyte

E) granulocyte

22) The hormone that regulates the rate of erythrocyte production is called:

A) renin

B) leukopoietin

C) vasopressin

D) erythropoietin

E) thrombopoietin

23) Megakaryocytes pinch off anucleate fragments called:

A) granulocytes

B) platelets

C) agranulocytes

D) erythrocytes

E) neutrophils

24) The series of reactions that stop blood flow following a cut is called:

A) homeostasis

B) coagulation

C) hemostasis

D) erythropoiesis

E) agglutination

25) Which one of the following represents the proper sequence of hemostasis:

A) platelet plug formation, coagulation, vascular spasm

B) vascular spasm, coagulation, platelet plug formation

C) coagulation, vascular spasm, platelet plug formation

D) vascular spasm, platelet plug formation, coagulation

E) coagulation, platelet plug formation, vascular spasm

26) Which chemical is released to bring about vasoconstriction during the vascular spasm phase of hemostasis:

A) renin

B) erythropoietin

C) serotonin

D) thrombopoietin

E) interleukin

27) Blood normally clots in approximately:

A) 1 minute

B) 3 to 6 minutes

C) 5 to 10 minutes

D) 15 minutes

E) 30 minutes

28) The formation of an insoluble clot during hemostasis is termed:

A) agglutination

B) coagulation

C) hematopoiesis

D) positive chemotaxis

E) diapedesis

29) Which of the following insoluble fibers forms a mesh network and the basis for the formation of a clot during coagulation:

A) albumin

B) fibrin

C) thrombin

D) fibrinogen

E) hemoglobin

30) A clot that breaks away from a vessel wall and circulates freely within the bloodstream is called a(n):

A) embolus

B) fibrin

C) thromboplastin

D) thrombus

E) clotting cascade