A) less \[C{{O}_{2}}\] and \[{{H}^{+}}\] ions
B) less \[{{O}_{2}}\] and \[{{H}^{+}}\] ions
C) excess \[C{{O}_{2}}\] and \[{{H}^{+}}\] ions
D) excess \[{{O}_{2}}\] and \[{{H}^{+}}\] ions
Correct Answer: C
Solution :
[c] Respiratory rhythm centre is a specialized centre present in the medulla of the brain which is primarily responsible for the regulation of respiration. A chemosensitive area situated adjacent to the rythm centre is highly sensitive to changes in \[C{{O}_{2}}\] and hydrogen ion concentrations in blood. Increase in \[C{{O}_{2}}\] and \[{{H}^{+}}\] ions stimulate this centre, which in turn stimulate the rhythm centre to make necessary adjustments in the respiratory process by which these substances can be eliminated.
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