2. Respiratory System The function of the respiratory is to inhale oxygen and exhale carbon dioxide. The interactions are that brain monitors the respiratory volume and blood gas levels. The brain regulates respiratory rates.

3. Skeletal System The Skeletal system’s function is that it gives the body framework and helps us move when our muscles contract. The interactions of the skeletal system are that bones provide calcium and the skull protects the brain from injury.

4. Muscular System The Muscular system’s function is to help move the body place to place and up and down. The Muscular systems interaction with other systems is the skeletal system because the help us move and walk also lift stuff up.

5. Digestive System The digestive systems function is to get the food from the mouth to the excretory system. The digestive system starts at your mouth and has many parts, such as, the esophagus, and small and large intestine.