How Systems Interact with One Another:
Circulatory System & Respiratory System
The Respiratory System provides oxygen, obtained from breathing, to supply the blood when it moves through the body (Circulatory) to supply all the organs and tissues. As the heart moves back through the heart and goes into the lungs, the oxygen is met there, then going back to the heart.
Circulatory System & Digestive System
The Digestive System works closely with Circulatory System to get the absorbed nutrients distributed through-out the body. The Circulatory System also carries chemicals signals from the endocrine System to control the speed of digestion.
Circulatory System & Nervous System
The Brain (part of the Nervous System) transmits signals and controls the heartbeat and blood pressure. The Nervous System signals the Circulatory System to work and in return the Circulatory System provides nutrients and and blood to them.