Endocrine system
Hormones: a second way of control.
Another message system
The nervous system sends electrical impulses along nerves. But the body has another way to send signals too, using chemicals.
Where do you think such a chemical signal acts compared with where it is made?
What this lesson covers
The idea
Animal hormones are part of the endocrine system, a second way of control and coordination; a hormone produced in one part of the body acts on target organs or tissues in another part.
Another message system
The nervous system sends electrical impulses along nerves. But the body has another way to send signals too, using chemicals.
Where do you think such a chemical signal acts compared with where it is made?
- In another part of the body, on target organs or tissues
- In exactly the same cell that made it
- Inside the brain only
Made here, works there
Press Next step.
A second system
The nervous system and the endocrine system are two ways the body controls and coordinates its work.
Animal hormones are part of the endocrine system, a second way of control and coordination. A hormone produced in one part of the body acts on target organs or tissues in another part.
Notes
Animal hormones are part of the endocrine system, a second way of control and coordination. A hormone made in one part of the body acts on target organs or tissues in another part.
Check yourself
Animal hormones are part of which system?
Where does a hormone act, compared with where it is produced?
How does the endocrine system relate to the nervous system?
- The peripheral nervous system. The peripheral nervous system is made of cranial and spinal nerves.
- The central nervous system. The central nervous system is the brain and the spinal cord.
- The endocrine system — correct. Yes!
- On target organs or tissues in another part of the body — correct. Yes!
- Only on the cell that made it. A hormone produced in one part of the body acts in another part.
- Only inside the gland that made it. Hormones act on target organs or tissues in another part of the body.
- It replaces the nervous system. The endocrine system is a second way, in addition to the nervous system.
- It is a second way of control and coordination — correct. Yes!
- It works by electrical impulses along neurons. Electrical impulses along neurons belong to the nervous system. Hormones belong to the endocrine system.