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Humans have to maintain the moderate respiratory rhythm to suit the demands of the body. For fulfilling that purpose, we have the:

Respiratory rhythm centre in medulla = R

Pneumotaxis centre in pons = PT

Chemosensitive area in medulla = C1

Peripheral chemoreceptor in aortic arch and carotid artery = C2

Select the correct path for the regulation of respiration.

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Column-I Column-II
(a) Pneumotaxic centre (i) Alveoli
(b) O2 Dissociation curve (ii) Pons region of the brain
(c) Carbonic anhydrase (iii) Haemoglobin
(d) Primary site of exchange of gases (iv) RBC
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