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Respiration in Organisms — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7ScienceRespiration in Organisms1 Mark
MCQ
During inhalation, the diaphragm moves:
  • ✓
    Moves downwards
  • B
    Moves upwards
  • C
    Moves towards left
  • D
    Moves towards right
✓

Answer

Correct option: A.
Moves downwards
When we breathe in or inhale, then two things happen at the same time.
First is, the muscles between the ribs contract causing the rib cage to move upward and outward and second is, the diaphragm contracts and moves downward.
The upward and outward movement of the rib cage, as well as the downward movement of the diaphragm, both increases the space in the chest cavity and make it larger.

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