1. EFFECT OF EXERCISE ON RESPIRATORY SYSTEM

2. The respiratory and cardiovascular systems combine to provide an effective delivery system that carries oxygen to, and removes carbon dioxide from, all tissues of the body.
This transportation involves four separate processes:

3. Pulmonary ventilation (breathing): movement
of air into and out of the lungs
Pulmonary diffusion: the exchange of oxygen and carbon dioxide between the lungs and the blood
Transport of oxygen and carbon dioxide via the blood
Capillary diffusion: the exchange of oxygen and carbon dioxide between the capillary blood and metabolically active tissues

4. The first two processes are referred to as external respiration because they involve moving gases from outside the body into the lungs and then the blood. Once
the gases are in the blood, they must be transported to
the tissues. When blood arrives at the tissues, the fourth
step of respiration occurs. This gas exchange between
the blood and the tissues is called internal respiration.
Thus, external and internal respiration are linked by
the circulatory system. The following sections examine
all four components of respiration.

8. https://books. google. co. in/books

9. https://books. google. co. in/books