Either your nose or mouth, and I know how the nose inhales it.
The nose hairs prevent dust particles passing through into the lungs.
The oxygen molecules get into the lungs, and that's about all I know. (:
The percentage of oxygen in inhaled air by humans is approximately 21%. This oxygen is then absorbed by the lungs and transported by the blood to the cells where it is used for energy production in the body.
Oxygen molecules are constantly cycling through the environment. They are produced by plants during photosynthesis, consumed by animals during respiration, and released back into the atmosphere. Eventually, oxygen molecules can be broken down by UV radiation into individual oxygen atoms.
yes!
No, it is not safe for humans to breathe liquid oxygen. Oxygen needs to be in a gaseous state in order to be breathable. Liquid oxygen is extremely cold and would cause damage to the respiratory system if inhaled.
Carbon dioxide (CO2). It is exchanged with Oxygen (O), which is inhaled. This exchange is called the Gas Exchange and it happens in the Aveolus.
Lungs get oxygen from the air that is inhaled through the respiratory system. Oxygen molecules in the air are transferred from the alveoli in the lungs into the bloodstream, where they are carried to cells throughout the body.
21% of the air we inhale is oxygen
Exhaled air contains 16% oxygen and 21% when inhaled.
Endocrine glands
About 21%
About 21%.
oxygen:)