Question

which best describes carbon dioxides 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

Explanation:

When carbon dioxide exits the body, it starts in the alveoli (where gas exchange occurs). Then it moves to the bronchus, then the trachea (windpipe). After that, it goes through the larynx (voice box), pharynx (throat), and finally out through the nose. The correct order should be alveoli → bronchus → trachea → larynx → pharynx → nose. Let's check each option:

• Option 1: This shows the path of air going into the body (inhalation) to reach the alveoli, not carbon dioxide exiting.
• Option 2: The order of trachea and bronchus is wrong. Air (and carbon dioxide) go from bronchus to trachea, not trachea to bronchus when exiting.
• Option 3: This has the correct order of alveoli → bronchus → trachea → larynx → pharynx → nose.
• Option 4: Similar to Option 1, it shows a path related to inhalation (air going in) rather than carbon dioxide exiting.

Answer:

alveoli → bronchus → trachea → larynx → pharynx → nose (the third option in the given choices)