Which best describes carbon dioxide’s path out of the body?
nose → pharynx → larynx → trachea → bronchus → alveoli
alveoli → trachea → bronchus → larynx → pharynx → nose
alveoli → bronchus → trachea → larynx → pharynx → nose
nose → larynx → pharynx → trachea → bronchus → alveoli

To exit it would be aveoli, bronchus, trachea, larynx, pharynx, nose, to enter is the opposite.

alveoli → bronchus → trachea → larynx → pharynx → nose

Blood capillaries carries the carbon dioxide from the entire body to the alveoli, these alveoli get combine to form bronchus. Both alveoli and bonchus are present in the lungs. The air containing carbon dioxide then flows through the trachea and then through larynx and pharynx and lastly, exhaled out from nasal cavity of nose.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.