Question

Question #2748f

Answer 1

The circulatory, digestive, nervous and reproductive system.

Explanation:

"The endocrine system is the collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood, among other things." https://www.livescience.com/26496-endocrine-system.html
The endocrine system works with four other systems:

Circulatory system - The circulatory system acts as the transport mode for the hormones to travel in as they seek to deliver their information to cells and organs around the body.
http://www.biology4kids.com/files/systems_endocrine.html

Nervous system - When hormones from the endocrine system physically react with cells, the nervous system uses the information from their feedback to react to certain extrema. Additionally, the nervous system's growth and development is affected by the endocrine system.

Digestive system - The pancreas is part of the endocrine system, as it produces the hormone insulin, which regulates the amount of sugar in the blood. People with too low or too high levels of insulin suffer diabetes which is as much a failure of the endocrine system as it is the digestive system.
http://endocrinesystems.weebly.com/how-the-endocrine-system-functions-with-other-systems.html

Reproductive system - The testicles are part of the endocrine system , and are used primarily in the production of sperm and androgens , with the main one being testosterone.
https://en.wikipedia.org/wiki/Testicle

I hope I helped!