ENDOCRINE
SYSTEM
ENDOCRINE SYSTEM


A SYSTEM OF
GLANDS THAT
PRODUCE CHEMICAL
MESSAGES CALLED
HORMONES
WORKS WITH THE
NERVOUS SYSTEM
TO KEEP BODY
RUNNING RIGHT
HORMONES


HORMONES HELP TO
REGULATE BODY
ACTIVITIES
CONTROL THE RATE AT
WHICH ACTIVITIES OF
ORGANS AND TISSUES
OCCUR




SPEED UP
SLOW DOWN
TURN ON
TURN OFF
ENDOCRINE vs. EXOCRINE

Endocrine System: secretes hormones that
are carried by the blood

Exocrine System: produce chemicals (not
hormones) which move through ducts in
organs
Ex. Salivary glands (spit)
Eye Ducts (tears)
Sweat Glands (sweat)
ENDOCRINE GLANDS

Hypothalamus:



At the base of the brain
Control all the other
glands
Pituitary Gland:



Has 2 parts-front and
back in the center of the
skull
Stimulates growth of
bone and sex organs
Controls blood pressure
and metabolism
ENDOCRINE GLANDS

Thyroid:



Parathyroids:



Located at the front of the
neck
Controls how fast food is
burned up in the body
on either side of thyroid
Controls calcium levels
Thymus:


Located behind the sternum
Develops the immune
system
ENDOCRINE GLANDS

Adrenals:



Located above the
kidney
They release hormones
to regulate stress
responses
 Ex. Adrenaline
Pancreas:


Controls sugar levels
Produces insulin
ENDOCRINE GLANDS

Ovaries & Testes

Control secondary sex
characteristics
 Ex. Estrogen and
Testosterone
NEGATIVE FEEDBACK

Negative Feedback Mechanism:
automatically controls the hormone levels in
the body

Production of one hormone is controlled by
the amount of another hormone in the blood