The cells of the body require a continuous supply of oxygen to produce energy and carry out their metabolic functions. Furthermore, these aerobic metabolic processes produce carbon dioxide, which must be continuously eliminated. The primary functions of the respiratory system include:

• Obtaining oxygen from the external environment and supplying it to the body's cells

• Eliminating carbon dioxide produced by cellular metabolism from the body

The process by which oxygen is taken up by the lungs and carbon dioxide is eliminated from the lungs is referred to as gas exchange.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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