Question

Which of the following occurs in the upper respiratory system?

Answer 1

air is filtered and moistened

Step-by-step explanation:

Answer 2

Head Area: The nose and mouth take in oxygen that goes through the throat and into the lungs. There are 2 ways, but a little flap opens when oxygen comes in and closes right after. This is used so food doesn't get in the wrong way.
Chest Area: Capillaries in the lungs move the oxygen to the heart to pump it throughout the body.