Complete the following sentence by selecting the correct option.
The breathing rhythm is generated in the (i) and is influenced by variation in levels of (ii)_ in the blood.

(i)medulla

(ii)

C O_{2}

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(i)medulla

(ii)

O_{2}

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(i)frontal lobe

(ii)

C O_{2}

and

O_{2}

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(i)frontal lobe

(ii)

C O_{2}

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Solution

The correct option is A (i)medulla
(ii) $C O_{2}$

The basic rhythm of respiration is generated mainly in the dorsal respiratory group in the medulla. Changes in blood carbon dioxide are believed to stimulate the neurons in the chemosensitive area which affect the rhythm centre. $C O_{2}$ acts by forming carbonic acid which dissociates into H+and $H C O_{3}^{-}$ . H+ has a direct effect on this. Oxygen does not have a significant direct effect on rhythm centre.
So the correct answer is 'A'.

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The information in which alternative completes the given statement?

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