The atomic mass of a proton is
A. 2 atomic mass units.
B. 1 atomic mass unit.
C. -1 atomic mass unit.
D. 0 atomic mass units.
Answer: B
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A decrease in the autonomic tone of the smooth muscle in a blood vessel would result in
A) no change in vessel diameter. B) a decrease in vessel diameter. C) oscillation in vessel diameter. D) a decrease in blood flow through the vessel. E) an increase in blood flow through the vessel.
The trophoblast is mostly responsible for forming the ________
A) placental tissue B) allantois C) lining of the endometrium D) archenteron
________ have been found to be the precursor cells of macrophages.
A) Monocytes B) Lymphocytes C) Basophils D) Eosinophils E) Neutrophils
Which term refers to contraction?
A. Systole B. Diastole C. Neither answer is correct. D. Both answers are correct.