Question

when you hold your breath which of the following gas changes in blood would first led to the urge to breathe:
a) falling co2 concentration
b) falling co2 and falling o2 concentration
c) falling O2 concentration
d) increasing CO2 concentration​

Answer 1

(d) increasing CO2 concentration

Answer 2

Answer:

c)

Explanation:

falling oxygen concentration because the CO2 present in the lungs combines with the haemoglobin of the blood in the form of carbamino haemoglobin and thus reduces the amount of oxygen that reaches the cells

thus urging us to breathe