Question

Which statement is true? Bronchitis can result in hoarseness. Cystic fibrosis is a genetic disorder that causes thick mucus secretions. Asthma causes a loss of appetite and weight. Pneumonia is an inflammation of the lungs that is caused only by bacteria.

Answer 1

Cystic fibrosis is a genetic disorder that causes thick mucus secretions.

Answer 2

Answer: Cystic fibrosis is a genetic disorder that causes thick mucus secretions.

Step-by-step explanation:

• Cystic fibrosis is a genetic disorder caused by mutations in a gene that makes a protein called CFTR (cystic fibrosis transmembrane regulator).
• The CFTR protein normally functions as a channel for transport of chloride ions in cells responsible for mucus production.
• A person suffering from cystic fibrosis produces abnormal CFTR protein or no CFTR protein at all.
• This is the reason that thick, sticky mucus is produced instead of the thin, watery kind.