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The SA node, also called the pacemaker of the heart, initiates the heartbeat by generating electrical impulses.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Circulatory System - Comparative and Evolutionary Aspects
Systole refers to the contraction phase of the heart, during which blood is pumped out.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
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