What is the role of serotonin in blood clotting?
A. Causes platelets to become sticky
B. Causes vasoconstriction of blood vessels to slow loss of blood
C. Converts fibrinogen to fibrin
D. Enhances the platelet release reaction
Answer: B
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The posterior wall of the trachea contains smooth muscle called the ________ muscle.
Fill in the blank(s) with the appropriate word(s).
The pericardial sac that encloses the heart is a two-layered structure. The outer layer is the ________
A) fibrous pericardium B) epicardium C) serous pericardium
The break of a bone that has been weakened by disease is a ________fracture; when a broken end of the bone pierces the skin, the fracture is ________
A. stress; greenstick B. epiphyseal; stress C. greenstick; simple D. pathologic; compound E. pathologic, simple.
A reticulocyte is a cell formed during erythropoiesis that has lost its nucleus and all organelles except some ribosomes
Indicate whether this statement is true or false.