Thrombin plays a direct role in
A) causing vasoconstriction of blood vessels.
B) activating factor X.
C) the conversion of fibrinogen to fibrin.
D) stimulating nitric oxide release.
E) the production of prothrombin.
Answer: C) the conversion of fibrinogen to fibrin.
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The respiratory surfaces of the nasal cavity are cleared by mucus produced in part by which of the following?
A) external nares B) paranasal sinuses C) soft palate D) nasal vestibule E) nasopharynx
The two types of electrical signals in neurons are ________.
Fill in the blank(s) with the appropriate word(s).
Protein-bound Ca2+ is the form of calcium that is important in neuromuscular excitability
Indicate whether the statement is true or false
Which of the following is NOT a general category of cell signaling molecules?
A. Endocrine signaling B. Paracrine signaling C. Synaptic signaling D. Enzymatic signaling