The gas exchange system — practice question

Using TB and COPD as examples, explain how infectious diseases are different from non-infectious diseases.

Using Fig. 3.1, explain how alveoli are adapted for gaseous exchange.

Using Fig. 3.1, explain how macrophages act to protect the lungs from infection.

Phagocytes secrete enzymes that break down proteins. In smokers, this can cause extensive destruction of alveolar walls. Outline the effects of this destruction on a person’s health.