A common oxidizing agent used to couple chemical reactions in cells is ________.
riboflavin
niacin
NADH
FAD
FAD
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Angiotensin II stimulates the adrenal cortex to release aldosterone
Indicate whether this statement is true or false.
Calcium is a bivalent ion that is responsible for neuromuscular transmission, cell membrane permeability, hormone secretion, and:
a. Bronchial constriction b. Production of ADH c. Release of chorionic gonadotropin d. Smooth muscle contraction
Norepinephrine is considered a positive chronotropic agent because it causes
A. an increase in the firing rate of SA node cells. B. thyroid hormone to have a steadying effect on heart activity. C. heart cell membrane potentials to become more positive during action potentials. D. less calcium to enter heart cells, which leads to lower risk of heart attack. E. more forceful contractions during each heart rate.
Why is a subcutaneous injection with a hypodermic needle a useful method of administering drugs?