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#___ Notes – Endocrine System
Homeostasis =

maintained by the
working together

What does the endocrine system do? It produces chemical signals (a.k.a. h
that go to another place by traveling through the b
system and the
system, both
)
.
How do the nervous system and the endocrine system interact? (p. 982)
Part of nervous system only
________________ - a nerve cell;
has three parts: _________________
______________________________
______________________________
Part of both systems
Part of endocrine system only
h_____________________________
- receives messages from _________
and internal ____________
p_____________________________
- main organ of the endocrine system
- stimulates
- located at the base of the
______________________________
(tells it what to do)
- controls other _________________
In general, how does the endocrine system work?
secretes a
that travels via
to reach a
A gland ------------------> _________________ ---------------------> ________________ -----------------> _________cell
and attaches to a
found either
--------------------> ______________ (a.k.a. binding site) ----------------> on the ________________ or in __________.
The cell reacts. How?


Control of the Endocrine System: (pp. 986-987)
H
monitors
concentration of water in the blood
too low?
tells posterior p
to secrete more
too high?
gland
(ADH)
tells posterior p
to secrete less anti-diuretic hormone (
carries ADH to target cells in the
)
respond to less ADH in
blood by
kidneys slow down the removal of water from the blood
you need to urinate
in the brain tells you that you’re thirsty
On the back: Draw a flowchart that shows how the body maintains normal levels of thyroxine. Add to this flowchart
(or draw another one) to show how body temperature affects thyroxine levels.
Why are these examples of negative feedback?