| A | B |
|---|
| ventricle | lower part of the heart, |
| carbon dioxide | this builds up in the blood and sends a message to the brain to breathe |
| villi | found in the small intestine, and provide more surface area to digest food |
| vein | takes blood back to the heart |
| diaphragm | dome shaped muscle that forms bottom of the chest |
| capillaries | these are the smallest blood vessels, they surround each air sac. |
| small intestine | receives chemicals from the pancreas and liver, helps digest food |
| kidneys | these clean the blood, regulate the salt in the blood, and control water in blood |
| trachea | tube that carries air from larynx to the lungs |
| white blood cells | When there is an infection, these change in number, shape, and size |
