Question
Explain the circulation path of blood in human heart.
✓
Answer
- The heart is a muscular organ as big as our fist.
- Human heart has different chambers to prevent oxygen rich blood from mixing with the blood containing carbon dioxide.
- The circulation path in human heart:
- Heart has $2$ upper receiving chambers called atria.
- It has $2$ lower chambers called ventricles which can push blood out of the heart.
- In left chambers:
- Oxygen rich blood from the lungs comes to the thin walled upper left chamber of the heart, i.e., left atrium through pulmonary veins.
- The left atrium relaxes when it is collecting this blood.
- Now, left atrium contracts, while left ventricle relaxes.
- So, that the blood is transferred to left ventricle.
- When the muscular left ventricle contracts, the blood is pumped through aorta and supplied to the whole body.
- In right chambers:
- Deioxygenated blood comes from the body to the upper right chamber, i.e., right atrium as it relaxes.
- As the right atrium contracts, the corresponding lower chamber, the right ventricle dilates.
- This transfers deoxygenated blood to the right ventricle, which in turn pumps it through pulmonary artery to the lungs for oxygenation.
- Valves ensure that blood does not flow backwards when the atria or ventricles contract.
- Since ventricles have to pump blood into various organs, they have thicker muscular walls, than the atria do.
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