- Created by: kstudent
- Created on: 01-06-18 11:17
Human endocrine system
Hormones and nerves
A hormone is a chemical substance, produced by a gland and carried in the bloodstream, which alters the activity of specific target organs. An example of this is the release of the hormone adrenaline, which is released by the adrenal glands. One of its target organs is the heart, where it increases the heart rate.
Once a hormone has been used, it is destroyed by the liver.
Like the nervous system, hormones can control the body. The effects are much slower than the nervous system, but they last for longer.
type of signal - chemical
transmission of signal - by the bloodstream
effectors - target cells in particular organs
type of response - chemical change
speed of response - slower