Question

1. food exchange

transporting air into and out of lungs
keeping body clean

1. what is the lungs most important function? *

the exchange of oxygen and carbon dioxide
exhaling carbon dioxide
inhaling oxygen

1. when you breathe in through the nostrils, the air enters the____? *

nose
pharynx
nasal cavity

Explanation:

1. The respiratory system's air - transport function involves moving air into and out of the lungs.
2. The lungs' primary role is gas exchange, taking in oxygen and expelling carbon dioxide.
3. When breathing through the nostrils, air first enters the nasal cavity for warming, filtering, and humidifying.

Answer:

1. Transporting air into and out of lungs
2. The exchange of oxygen and carbon dioxide
3. Nasal Cavity