I have two questions, 1. The circulatory system interacts with other body systems. How does the circulatory system help the excretory system and the digestive system do their jobs?
2. Choose one system and explain what would happen to a runner if that system failed to work properly.
Answer these two simple questions with a simple and unique answer, thanks!

1) The circulatory system interacts with other body systems. How does the circulatory system help the excretory system and the digestive system do their jobs?

Everyone's digestive system absorbs different types of nutrients from the specifc food you eat-

2)  Choose one system and explain what would happen to a runner if that system failed to work properly.

For instance in you're muscular system if a particular organ stops working that'll cause severe damage to other possible features in you're muscular system.