Understanding Human Blood Circulation

The schematic shows the human circulatory system with four labeled parts. Let's analyze each label and its function step by step.

Step 1: Identify the Components

Based on standard human heart anatomy:

• (i) Pulmonary vein: Carries oxygenated blood from lungs to the left atrium.
• (ii) Pulmonary artery: Carries deoxygenated blood from the right ventricle to the lungs.
• (iii) Aorta: Carries oxygenated blood from the left ventricle to the body parts.
• (iv) Vena cava: Carries deoxygenated blood from body parts to the right atrium.

Step 2: Evaluate Each Option

Option 1: "(i) Pulmonary vein - takes impure blood from body part." ❌ Incorrect. Pulmonary vein carries pure (oxygenated) blood from lungs to heart.

Option 2: "(iv) Vena cava - takes blood from body parts to the right auricle." ✅ Correct. Vena cava brings deoxygenated blood from body to right atrium (auricle).

Option 3: "(ii) Pulmonary artery - takes blood from lung to heart." ❌ Incorrect. It takes blood from heart to lungs, not from lungs to heart.

Option 4: "(iii) Aorta - takes blood from heart to body parts." ✅ Correct, but note: Option 2 is also correct and more specific to the label.

Step 3: Final Answer

Both (iv) and (iii) are correctly described, but since the question asks to "identify the correct label", and based on the options provided, (iv) Vena cava - takes blood from body parts to the right auricle is the most precise and correct match.

Related Topics & Formulae

Key Concepts:

• Double Circulation: Blood passes through the heart twice in one complete cycle (pulmonary and systemic circuits).
• Oxygenation: Lungs oxygenate blood; body tissues deoxygenate it.

Important Vessels & Functions:

• Pulmonary Artery: Deoxygenated blood → Lungs
• Pulmonary Vein: Oxygenated blood → Heart
• Aorta: Oxygenated blood → Body
• Vena Cava: Deoxygenated blood → Heart

Flow Equation (Simplified):