The brain stem consists of the ________.
A) cerebrum, pons, midbrain, and medulla
B) midbrain, medulla, and pons
C) pons, medulla, cerebellum, and midbrain
D) midbrain only
B) midbrain, medulla, and pons
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Water causes ionically-bonded atoms to
A) bond covalently. B) dissociate. C) bond more strongly. D) decompose.
Depolarization of a cardiac muscle cell occurs as the result of
A. the closure of the voltage-gated Na+ channels. B. a decrease in the permeability of the plasma membrane to Na+. C. the opening of voltage-gated Na+ channels and voltage-gated Ca2+ channels. D. the opening of voltage-gated K+ channels. E. the closure of voltage-gated Ca2+ channels.
All of the substances listed have an enterohepatic circulation EXCEPT ________.
A. tetracycline B. bilirubin C. cholesterol D. penicillin
The least common, but most deadly, type of skin cancer is ________
A) skin sarcoma B) squamous cell carcinoma C) melanoma D) basal cell carcinoma E) skin lymphoma