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______ prevents the backflow of blood.
1. Left Artium
2. Septum
3. Pulmonary Artery
4. Valves

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Correct Answer - Option 4 : Valves

The correct answer is Valves.

  • Valves
    • It prevents the backflow of blood.
    • There are four types of valves: two atrioventricular valves and two semilunar valves.
      1. Atrioventricular valves: present between the atria and the ventricles.
      2. Semilunar valves: present in the arteries leaving the heart.

  • Left atrium
    • It receives oxygenated blood from the lungs via the pulmonary vein.
  • Septum
    • It prevents the mixing of deoxygenated and oxygenated blood.
  • Pulmonary Artery
    • It carries deoxygenated blood to the lung.

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