1
It is a gas which is considered as a waste, that goes from the bloodstream to the alveoli, so it can be eliminated to the outside of the body
2
These are smaller tubes which are branches of the bronchi and they are connected to the alveoli.
3
It is a big muscle that is below the lungs. It goes down when we inhale the O2 and it goes up when we exhale the CO2.
4
They are tiny and microscopic air sacs which look like grapes; they have capillaries and the air passes through them to the bloodstream.
5
The trachea or windpipe divides at the end into these two branches and they are connected into the lungs
6
It is a long tube is made with rings of cartilage and the air passes through it from below the larynx.
7
It is a vital gas from the air that we inhale and it is important for us to do our physical activities.
8
It is the first part of the respiratory system where we inhale the air/oxygen.
