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Heart valves prevent the backflow of blood and ensure unidirectional flow.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Circulatory System - Comparative and Evolutionary Aspects
The pulmonary valve prevents backflow of blood into the right ventricle after it enters the pulmonary artery.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
The aortic valve prevents blood from flowing back into the left ventricle from the aorta.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
The pulmonary valve prevents backflow into the right ventricle, not the left ventricle.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
The AV valves (tricuspid and bicuspid) prevent backflow into the atria when the ventricles contract.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
The mitral valve (bicuspid valve) prevents backflow of blood from the left ventricle into the left atrium.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
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