You all ready know how the endocrine system helps the digestive system (If you forgot, it in the organs and gland page), but not all. The endocrine system helps the nervous system by sending signals to help with your bodily activities. It also helps the reproductive system, in making hormones to make you mature more than you already are.Finally, the endocrine system helps the muscular system by letting all the cells in your body corporate in moving... I don't want to see what would happen if it didn't help it. Just know the endocrine system helps all the systems in it own different way.