endocrine system
Download
Report
Transcript endocrine system
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