your nose
The nose.
Oxygen enters via the lungs.
Oxygen enters the blood in the alveoli of the lungs
Oxygen enters via the lungs.
After the mouth (or nose), oxygen (as part of the air) goes down your trachea, into the bronchi, and through the bronchioli, into the alveoli, where it enters the blood and gets taken via the blood to the various parts of your body.
Oxygen rich air enters the body through the lungs.
The nose.
Oxygen enters via the lungs.
Oxygen enters the blood in the alveoli of the lungs
oxygen
Oxygen enters via the lungs.
the lungs
Through your mouth and nose
Air, oxygen
The respiratory system.
mouth and nose
About 20%.