The lungs take in oxygen directly from the air.
Your nose and mouth.
your stomach is on the left side of your body
The medical term for air passed from the stomach through the mouth is "belching" or "eructation". This typically occurs as a natural way for the body to release excess gas in the digestive system.
The stomach and small intestines are the primary organs responsible for digesting food in the human body. The stomach secretes digestive enzymes and acids, while the small intestines absorb nutrients from the digested food.
stomach
By digesting the food that you eat.While in the process of digesting the food the stomach takes out anything useful to your body. Then it sends the useful things to the correct systems or parts in your body.
Breathing. Inhaling oxygenated air through our nostrils.
Is food in the stomach in the external or internal environment of the body?
Your body takes in air through your nose and mouth. There is another interpretation of the original question. "to respire"
when you inhale and exhale the air get into the stomach
of course not don't be absurd
Most of the physical digestion takes place in the stomach, but the completion and absorption is done in the small intestine.
The lungs take in oxygen directly from the air.
Your body takes what it needs and then the rest gets exhaled out and goes into the atmosphere.
Your nose and mouth.
inhale air which passes through the lungs then veins takes it to the heart and it takes it round the body