A slower-than-normal heart rate is called
A) fibrillation.
B) premature contractions.
C) tachycardia.
D) bradycardia.
E) None of the answers is correct.
Answer: D
Anatomy & Physiology
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A central (Haversian) canal may contain arteries, veins, capillaries, lymph vessels, and ________ fibers.
Fill in the blank(s) with the appropriate word(s).
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Which of the following does not play a direct role in immune surveillance against cancer?
a. B cells. b. natural killer cells. c. macrophages. d. cytotoxic T cells. e. interferon.
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Damage to cranial nerve IX would impair swallowing.
Answer the following statement true (T) or false (F)
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The allantois
A. is the fetal half of the placenta. B. becomes the umbilical cord vessels. C. cushions and protects the embryo with fluid. D. is the first site of blood cell formation.
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