18.1 Introduction

1			Erythrocytes constitute less percentage of whole blood volume than plasma. However, they settle at the bottom because
			A)	numerous red blood cells give this fraction a very high density.
			B)	the plasma is ~ 98% water.
			C)	white blood cells and platelets are less dense.
			D)	All of the above are correct.
2			Another name for the erythrocyte fraction is the ________________.
			A)	hematocrit
			B)	hemoglobin
			C)	leukocrit
			D)	serum
3			The term "formed elements" refers to
			A)	the non-cellular components of blood.
			B)	the cellular components of blood.
			C)	the matrix of blood.
			D)	Both non-cellular and cellular components of blood.

18.2 Erythrocytes

4			Jaundice reflects an accumulation of ____ in the blood.
			A)	iron
			B)	bile
			C)	heme
			D)	urochrome
			E)	bilirubin
5			The gene for sickle cell arose as a defense for what disease?
			A)	malaria
			B)	thalassemia
			C)	iron-deficiency anemia
			D)	erythroblastosis fetalis

18.3 Blood Types

6			A person with type A blood has
			A)	anti-B agglutinin.
			B)	anti-A agglutinin.
			C)	anti-B and anti-A agglutinin.
			D)	A agglutinin.

18.4 Leukocytes

7			A differential WBC count shows an abnormally high count of mature neutrophils. This is a sign of
			A)	myelocytic leukemia.
			B)	lymphocytic leukemia.
			C)	bacterial infection.
			D)	parasitic infestation.
8			The largest of the formed elements is this WBC.
			A)	basophils
			B)	monocytes
			C)	eosinophils
			D)	neutrophils

18.5 Platelets and Hemostasis-The Control of Bleeding

9			Vascular spasm is triggered by all but which of the following?
			A)	pain receptor stimulation
			B)	injury to smooth muscle of vessel
			C)	serotonin released from platelets
			D)	growth factors secreted by platelets
10			Most procoagulants are proteins produced by the ______.
			A)	spleen
			B)	red bone marrow
			C)	liver
			D)	hypothalamus