16.1: The endocrine system is one of the body's two major control systems
Paracrine
A cell target a nearby cell
Endocrine
A cell targets a distant cell through the bloodstream
Autocrine
A cell targets itself
Target cell
Cell that recognizes the chemical signal that was sent
The Nervous System
Control body functions using electrical signals called action potentials.
The Endocrine System
Controls body functions using chemical signals called hormones.
Hormones travel more slowly through the blood
Endocrine System
Response lasts much longer
Endocrine System
Target cells respond for longer duration, seconds to days
Endocrine System
Electrical signal travels quickly
Nervous System
Response is short-lived
Nervous System
Target cells respond for a short period of time, milliseconds
Nervous System
Receptor
Protein on or inside target cell that binds signaling molecule
Signaling cell
makes and releases chemical signal
Signaling molecule
small chemical that travels between cells called ligand
