Question

Briefly mention the steps in double-circulation through human heart.

Hint:

Double circulation = Pulmonary + Systemic circulation. Blood passes through heart twice in one cycle.

Answer 1

Concept: Double circulation is the process in which blood passes through the heart twice during one complete cycle — once through pulmonary circulation and once through systemic circulation. Steps in Double Circulation: 1. Pulmonary Circulation (Heart → Lungs → Heart):

• Deoxygenated blood from the body enters the right atrium through the superior and inferior vena cava.
• Blood flows from the right atrium to the right ventricle.
• The right ventricle pumps blood to the lungs through the pulmonary artery.
• In the lungs, carbon dioxide is exchanged for oxygen.
• Oxygenated blood returns to the left atrium through the pulmonary veins.

2. Systemic Circulation (Heart → Body → Heart):

• Oxygenated blood moves from the left atrium to the left ventricle.
• The left ventricle pumps blood to the entire body through the aorta.
• Body cells use oxygen and release carbon dioxide.
• Deoxygenated blood returns to the right atrium through veins.

Conclusion: In double circulation, blood flows through the heart twice in one complete cycle — ensuring efficient oxygen supply and separation of oxygenated and deoxygenated blood.