1.
Your windpipe branches into two of these
2.
Tiny air sacs surrounded by blood capillaries
3.
Process of oxygen moving into blood and carbon dioxide moving out of blood (2 words)
4.
When breathing in, the diaphragm _______.
5.
When breathing out, the diaphragm _________.
6.
Millions of alveoli give a ___________. (3 words)
7.
Takes blood from the heart to the lungs (2 words)
8.
Takes blood from the heart to the body
9.
The type of muscle the heart is made out of
10.
The side of the heart which pumps blood to the lungs to pick up oxygen
11.
The two bottom chambers of the heart
12.
The name given to the blood going through the heart twice in one circuit of the body (2 words)
