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Body Fluids and Circulation — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYBody Fluids and Circulation1 Mark
MCQ
Blood returns from lungs to the heart into the?
  • A
    Right atrium
  • B
    Right ventricle
  • C
    Left ventricle
  • D
    Left atrium
✓

Answer

  1. Left atrium

Explanation:

The oxygenated blood leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. 

This blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. 

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