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STD 11 - 14. Breathing and exchange in gases — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 14. Breathing and exchange in gases1 Mark
MCQ
Why do human beings face difficulty to breath in high elevations?
  • A
    Lower $\%$ of $O _{2}$
  • B
    Temperature lower
  • C
    High pressure
  • ✓
    Low $\rho O _{2}$
✓

Answer

Correct option: D.
Low $\rho O _{2}$
d
Inspiration takes place when those is negative pressure of $O_{2}$ inside the body than outside. In the mountains, there is less pressure of $O_{2}$ (negative) than inside, that's why, breathing is difficult in mountain regions

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