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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 left ventricle pumps blood into the aorta, not the pulmonary artery. The right ventricle pumps blood into the pulmonary artery.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
The left ventricle has the thickest wall to generate high pressure for pumping blood to the entire body.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
The left ventricle pumps blood to the aorta, not the lungs. The right ventricle pumps blood to the lungs.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
Amphibian heart three-chambered architecture comprises two separate atria left atrium receiving oxygenated blood from pulmonary veins and cutaneous veins, right atrium receiving deoxygenated systemic venous blood via sinus venosus, and single undivided ventricle with trabeculae carneae and spiral valve within conus arteriosus partially directing streams reducing mixing. Systemic and pulmocutaneous circuits partially overlapping, less efficient than four-chambered avian mammalian. Sinus venosus and truncus arteriosus prominent embryonic remnants persisting, reflecting transition between two-chambered fish heart and fully septated amniote heart. This concept holds high importance for NEET, CBSE board, CUET and competitive examinations focusing on comparative
Ref: NCERT Class 11 Chapter 18 Amphibian Circulatory System; Campbell Biology 12th ed. Chapter 42 Heart Evolution
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