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The AV node slows down the electrical signal from the SA node before sending it to the ventricles, allowing the atria to contract first.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Circulatory System - Comparative and Evolutionary Aspects
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
The cardiac cycle consists of systole (contraction) and diastole (relaxation) of the heart chambers.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
Diastole is the relaxation phase of the heart, allowing blood to fill the chambers.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
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
The duration of one complete cardiac cycle is about 0.8 seconds in a healthy adult.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
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