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Which of the following is true of the contraction of the heart
Q11: In the adult, red blood cells are
Q15: The main pacemaker region of the heart
Q26: Label E: _
Q52: Cardiac muscle cells do not need _
Q65: Label P: _
Q78: Information about pressure and gas concentration in
Q95: Label V: _
Q150: Aldosterone is released from the suprarenal cortex.
Q181: A _ receptor becomes active only when
Q190: Label R: _