Chapter 45 Hormones & the Endocrine System. Main Ideas 1.) A hormone is a chemical signal that is secreted into the circulatory system & communicates.
Getting on your Nerves. What a lot of nerve! There are about 100,000,000,000 neurons in an adult human. These form 10,000,000,000,000 synapses, or connections.
AIM: How does the Endocrine System achieve regulation?
The Endocrine System. I. Hormones: A.Endocrine system produces hormones that are important in maintaining homeostasis & regulating reproduction & development.
Chapter 15
