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

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.