Question

16. Ventral group of neurons in medulla get stimulates
so that breathing rate will increase automatically
when
(1) The blood pH falls or acidity increases
(2) The amount of co, in the blood decreases
(3) The blood pH increases or acidity decreases
(4) Complete saturation of haemoglobin occurs​

Answer 1

Answer:

(1) pH falls or acidity increases

Explanation:

Receptors for the change in concentration of CO2 and H+ are present in the Aortic arc. but there are no receptors present for determining the concentration of O2.

We need to increase the rate of breathing when O2 level falls or CO2 level increases or H+ increases or simply pH decreases.