What effect does the sympathetic nervous system have on the heart?
A) It increases the speed and strength of contractions.
B) It makes the heart more likely to fail.
C) It makes the heart less responsive to medication.
D) It slows the speed and decreases the strength of contractions.
A
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What sac of endoderm and mesoderm extends away from the embryo and later gives rise to the urinary bladder?
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In the year 2000, more than ________ million Americans were over the age of 65
A) 35 B) 40 C) 25 D) 45
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