human
I'm trying to learn about the human body.
assistant
That's a good place to start!  There are many different systems in the human body, and each system has its own function. The nervous system is responsible for sending signals throughout the body, while the endocrine system helps regulate hormones that affect almost every cell of the body. Other important systems include the digestive system, immune system, circulatory system, respiratory system, urinary system, and reproductive system. Each system works together to keep your body functioning properly.