Viagra works by blocking ________ , which raises cGMP concentration, and promotes vasodilation of vascular smooth muscle of the penis.
A. aromatase
B. cGMP phosphodiesterase
C. ATPase
D. 5-alpha reductase
Answer: B
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Select the statement that is true concerning primary teeth
A) There are 20 primary teeth, and by 24 months of age most children have all 20. B) There are 27 primary teeth, and the molars are permanent. C) There are 32 primary teeth, and by 36 months of age, most children have all 32. D) There are 24 primary teeth, and no new primary teeth appear after 13 months.
The exchange of nutrients and gases between the blood and tissue cells is the primary function of ________.
A. veins B. venules C. arteries D. arterioles E. capillaries
Identify the structure that separates the thoracic cavity from the rest of the ventral cavity
A) Label A
B) Label B
C) Label C
D) Label D
E) Label E
F) Label F
Which of the following organelles function in the destruction of nonfunctional organelles?
A. Endoplasmic reticulum B. Centrioles C. Mitochondria D. Lysosomes E. Basal bodies