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

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 14. Breathing and exchange in gases1 Mark
MCQ
Which substances when present in high level can activate the chemosensitive area present adjacent to rhythm centre?
  • A
    $CO_2$ and $O_2$
  • B
    $HCO _{3}^{-}$ions and $O _{2}$
  • ✓
    $CO _{2}$ and $H ^{+}$ions
  • D
    $H ^{+}$and $HCO _{3}^{-}$ions
✓

Answer

Correct option: C.
$CO _{2}$ and $H ^{+}$ions
c
Chemosensitive area i.e. sensitive for chemicals and is located adjacent to the rhythm centre which contains chemoreceptors which are sensitive for $CO _{2}$ and $H ^{+}$ions. The respiratory centre is stimulated by concentration or partial pressure of $CO _{2}$ and $H ^{+}$ions in blood and body fluids.

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