Question

'P' in the heart has thicker muscular walls than 'Q'. Also, 'R' ensures that blood does not flow backwards when the 'P' or 'Q' contract. Identify 'P', 'Q', and 'R'.

  • P: Ventricles, Q: Atria, R: Valves
  • P: Atria, Q: Ventricles, R: Valves
  • P: Ventricles, Q: Blood vessels, R: Atria
  • P: Blood Vessels, Q: Atria, R: Valves

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Answer


The correct option is A: P: Ventricles, Q: Atria, R: Valves

  1. Ventricles have thicker muscular walls compared to atria because they are responsible for pumping blood into various organs.
  2. Atria have thinner walls as they primarily receive blood returning to the heart from the body.
  3. Valves ensure that blood does not flow backwards when either the ventricles or atria contract.

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