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Question 4 (1 Point) The SA Node Regulates Temperature Control in an Arm the Contraction of the Ventricles the Contraction of the Atria

Question

Question 4 (1 point) The SA node regulates temperature control in an arm the contraction of the ventricles the contraction of the atria how much blood enters the atrium when the ventricles open

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Answer

The SA node regulates **the contraction of the atria**. The sinoatrial (SA) node is the natural pacemaker of the heart. It generates electrical impulses that cause the atria to contract, initiating the heartbeat.