The part of the heart muscle that usually depolarizes first in a heartbeat is the ____________________.
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Q172: The cardiac cycle is the sequence of
Q173: The heart is a double pump: the
Q174: The part of the heart that initiates
Q175: The normal range of resting heart rate
Q176: In the cardiac cycle, the most important
Q178: During the cardiac cycle, the _ contract
Q179: In the cardiac cycle, all blood from
Q180: The part of the heart that initiates
Q181: If cardiac output is 6000 mL and
Q182: The difference between the resting cardiac output
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