Download Endocrine System

Endocrine System
Hormones
Reproduction
AP Biology
Hormones

Why are hormones needed?
chemical messages from one body part
to cells in other parts of body
 communication needed
to coordinate whole body
 maintaining homeostasis






energy production
growth
development
maturation
reproduction
Regents Biology
growth hormones
Endocrine System

Endocrine system releases hormones

glands which secrete
chemical signals into blood
chemicals cause changes
in other parts of body
 slow, long-lasting response

Regents Biology
 growth hormones
 sex hormones
 response hormones
 metabolism hormones
 and more….
Regulation by chemical messengers


Neurotransmitters released by neurons
Hormones release by endocrine glands
endocrine gland
neurotransmitter
axon
hormone
carried by blood
receptor proteins
Regents Biology
receptor proteins
target cell
Glands

Pineal


Pituitary


insulin, glucagon
Ovary


adrenaline
Pancreas


thyroxine
Adrenal


many hormones:
master gland
Thyroid


melatonin
estrogen
Testes

testosterone
Regents Biology
Feedback
Maintaining homeostasis
hormone 1
lowers
body condition
gland
high
specific body condition
low
raises
body condition
Regents Biology
gland
hormone 2
Negative Feedback

Response to changed body condition
every time body is high or low from
normal level a signal tells the body to
make changes that will bring body back to
normal level
hormone 1
 once body is back
to normal level,
lowers
gland
signal is
body condition
turned off

high
Regents Biology
specific body condition
Nervous System Control
Feedback
Controlling Body Temperature
nerve signals
brain
sweat
high
body temperature
low
brain
constricts surface shiver
blood vessels
Regents Biology
nerve signals
dilates surface
blood vessels
Endocrine System Control
Regulation of Blood Sugar
Feedback
insulin
liver stores
sugar
body
cells take
up sugar
from blood
pancreas
high
liver
blood sugar level
(90mg/100ml)
low
triggers
hunger
Regents Biology
liver
releases
sugar
liver
pancreas
glucagon
reduces
appetite
Negative Feedback

Negative feedback

every time body is
high or low from
normal level a signal
tells the body to
make changes that
will bring body back


body temperature
control of blood sugar
Regents Biology
Any Questions??
AP Biology