Question

effects of cystic fibrosis

1. how does cystic fibrosis increase the risk of respiratory

infections, such as bronchitis and pneumonia?
a. by causing mucus to build up in airways
b. by destroying cells of the immune system
c. by reducing blood flow to the lungs
d. by increasing air flow to the lungs

Explanation:

Cystic fibrosis is a genetic disorder that affects the production of mucus. In cystic fibrosis, the mucus becomes thick and sticky. This thick mucus builds up in the airways. Bacteria can easily get trapped and grow in this thick mucus, increasing the risk of respiratory infections like bronchitis and pneumonia. Option B is incorrect as cystic fibrosis does not primarily destroy immune - system cells. Option C is wrong because it is not about reducing blood flow. Option D is incorrect as it is not about increasing air flow.

Answer:

A. by causing mucus to build up in airways