Question

Explain how oxygen enters in human body?

Answer 1

Answer:

by our nose it goes to our food pipe and pharynx and the stomatch

Answer 2

From Atmosphere to lungs,

When you breathe in (inhale), air containing oxygen enters your windpipe, passes through the bronchi and eventually reaches the air sacs. These air sacs, called alveoli, are responsible for gas exchange. They look a bit like grapes at the end of the bronchial branches

From Lungs To Blood,

Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. A protein called haemoglobin in the red blood cells then carries the oxygen around your body.