How does regular exercise maintain a healthy respiratory system?

a) it cilia in the lungs eliminate mucus.

b) it lungs from becoming too large.

c) it lungs exchange gases at a slower rate.

d) it lungs become more efficient at gas exchange.

Which symptoms is a short term effect of tobacco use

In some states, medical marijuana is legal. this means that people who need to take marijuana because of a medical condition may take it only with approval from the doctor. however, officers still advise these people not to drive while under the influence.what is the main reason for this? they would become dangerous to themselves and other people.they would not able to read and follow street signs.they would not be capable of staying in only one lane.they would become dangerous to wildlife that may be present.

Annie is experiencing migraine headaches, so she visits her primary care doctor and pays with the insurance provided by her employer. what type of healthcare organization is annie utilizing?