Question

Why does the rate of breathing increase while walking up hill at a normal pace in the mountains ?give two reasons

Answer 1

higher altitude the rate of breathing breathing increases

Answer 2

because as we go up the hill above sea level the concentration of O2 is greatly reduced so we have to breath more to get required amount of O2
while walking the Uphill a lot of oxygen is used by our body to release energy from glucose this leads to Lake of O2 in the cell
hence to increase the amount of O2 intake there is an increase in breathing rate during walking uphill