2. Hormones are:
Chemical messengers
Produced by endocrine glands
Released into the blood stream
Show their effect on certain organs that
we call target organs
3.
4. Adrenaline: Fight – Flight hormone
This hormone is produced in
times of fear and stress.
It causes changes that help a
person to survive in times of
danger.
It is produced by adrenal glands
present on top of each kidney.
The hormone affects many
organs in the body, the heart,
lung, eyes, blood vessels, skin.
5. Effect of adrenaline on
your body
How it helps to save
you
Eye pupils dilate
Heart rate increases
The breathing rate
increases
Blood vessels in the skin
& gut constrict, while
those in muscles & brain
dilate
Liver breaks down
stored glycogen to
glucose
Hairs stand on end
More light enters the eye to see
clearly
To pump more blood to the
muscles
To supply the blood with more
oxygen
Blood shifts to where it is
needed most
More glucose is needed for
muscles to produce energy
This makes the animal seem
larger to scare away what’s
frightening it.