Ultimately, the rhythm of the heart is controlled by the nervous system and a variety of signaling compounds like hormones.
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Q50: Muscular animal hearts must generate enough force
Q51: In an insect's _ circulatory system, blood
Q52: The sound of a human heartbeat as
Q53: The pressure in the arteries is highest
Q54: When the muscles of the heart relax,
Q56: An increase in the amount of water
Q57: _ are the vessels that carry blood
Q58: In human hearts, ventricles receive blood directly
Q59: The sinoatrial (SA) node is also called
Q60: "Good" cholesterol is carried in _-density lipoproteins.
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