The heart is enclosed by three membranes: an outer fibrous layer and an inner serous membrane pair.
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Q77: The heart sounds "lub" and "dup" result
Q78: All four heart valves are briefly closed
Q79: Veins _.
A) carry blood away from the
Q80: Which of the following blood vessels is
Q81: Which of the following is NOT a
Q83: Substances tend to leave the bloodstream at
Q84: Blood is returned to the right side
Q85: The heart sounds, "lub" and "dup," occur
Q86: The semilunar valves prevent the backflow of
Q87: The friction blood encounters as it flows
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