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Mixed Quiz
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1Erythrocytes 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


2Another name for the erythrocyte fraction is the:
A)hematocrit
B)hemoglobin
C)leukocrit
D)serum


3The 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 a and b

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4In panel a, vascular spasm is the result of:
A)sympathetic nervous system activity in the vessel
B)parasympathetic nervous system activity in the vessel
C)hypovolemic shock
D)a rise in local blood pressure


5A platelet plug forms because:
A)platelets stick to the injured area
B)platelets release clotting factors
C)a positive feedback mechanism is in effect
D)all of the above


6Collagen fibers are:
A)normally present in a soluble form in the matrix of blood
B)only desolubilize upon injury to a vessel
C)are not a normal constituent of blood
D)are transported by the platelets from other tissues





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