Q9  What happens to the respiratory process in a man going up a hill?

Answers (1)

When a man goes uphill, he gets less oxygen with each breath and as we know that when altitude increases, the oxygen level in the atmosphere decreases. 

Because of this, the amount of oxygen in the blood start to decline. The respiratory rate increases in the response to the decrease in the oxygen content of the blood. Simultaneously, the rate of heartbeat increases to increase the supply of oxygen to the blood.