What type of cells contain histamine and heparin?
A) monocytes
B) neutrophils
C) mast cells
D) lymphocytes
E) eosinophils
Answer: C
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Valves in veins
A. make the use of a skeletal muscle pump unnecessary for venous blood flow. B. are found only in the largest veins. C. are formed of the tunica media. D. are the leading cause of high blood pressure. E. cause venous blood flow to go in only one direction.
Which is NOT true about cofactors involved in enzymatic reactions?
A. They may alter the conformation of the enzyme. B. Only a small number of cofactor molecules may be needed to maintain enzyme activity. C. They may be a metal such as iron. D. There must be equal quantities of enzyme and cofactor molecules for a reaction to proceed. E. They may be a substrate in a catalyzed reaction.
The common pathway of coagulation begins with the
A) sticking of platelets to damaged tissue. B) activation of a proenzyme exposed to collagen. C) release of tissue factor by damaged endothelium. D) activation of Factor X and production of prothrombin activator. E) conversion of fibrinogen to fibrin.
The ________ is a wall that separates the two sides of the heart.
Fill in the blank(s) with the appropriate word(s).