What part of the cardiac electrical conduction system initiates electrical impulses at the slowest rate?
A. The sinoatrial node
B. Areas below the AV node
C. Any part of the AV node
D. The atrioventricular node
Answer: B. Areas below the AV node
Health Professions
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The term that defines the volume of blood pumped out of one ventricle of the heart in a single beat or contraction is:
A) cardiac volume B) input volume C) preload volume D) stroke volume
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The herbal supplement melatonin has ________ effects.
A) diuretic B) sedative C) antioxidant D) antitoxin
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The white half-moon-shaped area at the base of a nail is called a(n) ________ and contains very active keratinocytes.
Fill in the blank(s) with the appropriate word(s).
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An inflammation of a vein near the skin surface, with the formation of a clot is ____
A) phlebitis B) thrombophlebitis C) embolus D) varicose veins
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