Chapter 23, Problem 3CSL

Summary Introduction

To determine:

The conditions that stimulated Mark to breathe harder, its effect on ${\text{P}}_{{\text{CO}}_{\text{2}}}$, and potential changes in blood $\text{pH}$. Also, determine whether low or high oxygen is reaching the blood.

Concept introduction:

The oxygen content in the atmosphere is 21%. As a person goes up the altitude, the partial pressure of oxygen ${\text{(P}}_{{\text{O}}_{\text{2}}})$ decreases. An individual breathes harder while climbing mountain so as to provide sufficient oxygen to the body. Otherwise, low oxygen content would lead to hypoxia.