Platelets release ________, a chemical vasoconstrictor that contributes to the vascular spasm.
A. heparin
B. thromboplastin
C. serotonin
D. prostacyclin
E. thrombin
Answer: C
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Which bone does not contain a paranasal sinus?
A. Sphenoid bone B. Maxilla C. Mandible D. Frontal bone E. Ethmoid bone
Which sinus does the number 1 indicate?
A. Ethmoidal sinus B. Anterior sinus C. Sphenoidal sinus D. Maxillary sinus E. Frontal sinus
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