I found this info on BBC GCSE Bitesize and it has helped me understand hormones alot easier.

Hope it helps!

HideShow resource information
  • Created by: Sarah
  • Created on: 10-04-11 14:16
Preview of Hormones

First 227 words of the document:

Hormones are chemical substances that help to regulate
processes in the body. Hormones are secreted by glands and
travel to their target organs in the bloodstream. Several
hormones are involved in the female menstrual cycle. Hormones
can be used to control human fertility and have advantages and
Hormones and glands
Hormones are chemicals secreted by glands in the body. Different
hormones affect different target organs. The bloodstream transports
hormones from the glands to the target organs.
Move the mouse over the different glands to see what they do.
Hormones regulate the functions of many cells and organs
The target organ and effects of glands and hormones
Gland Hormone Target organs Effect
adrenal adrenalin vital organs, eg Prepares body for action 'fight or
gland liver and heart flight'.
ovary oestrogen ovaries, uterus, Controls puberty and the menstrual
pituitary gland cycle in females stimulates
production of LH and suppresses
the production of FSH in the
pituitary gland.
ovary progesterone uterus Maintains the lining of the womb
suppresses FSH production in the
pituitary gland.
pancreas insulin liver Controls blood sugar levels.
pituitary antidiuretic kidney Controls blood water level by
gland hormone (ADH) triggering uptake of water in

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Triggers egg ripening and
gland stimulating oestrogen production in ovaries.
hormone (FSH)
pituitary luteinising ovaries Triggers egg release and
gland hormone (LH) progesterone production in ovaries.
testes testosterone male Controls puberty in males.
Control of internal conditions
It is important that the internal environment of the body is controlled.
Maintaining a constant internal environment is called homeostasis.…read more

Page 3

Preview of page 3

Here's a taster:

Blood sugar levels
This is controlled to provide cells with a constant supply of energy.
Blood sugar level is controlled by the release and storage of glucose
controlled by insulin [insulin: A hormone that regulates the level of
sugar in the blood. It is produced in the Islets of Langerhans, in the
Pancreas. ].…read more

Page 4

Preview of page 4

Here's a taster:

The hormone LH causes the mature egg to be released from the ovary.
This image shows how the level of oestrogen changes during the
menstrual cycle. Progesterone is another hormone secreted by ovaries:
it maintains the lining of the uterus and stays high during pregnancy.
Hormone levels during the mentrual cyle
This animation shows how the levels of FSH and LH change during the
menstrual cycle.…read more

Page 5

Preview of page 5

Here's a taster:

Fertility treatment
Some women have difficulty becoming pregnant because they don't
produce enough FSH to allow their eggs to mature. 'Fertility drugs'
contain FSH, which stimulates eggs to mature in the ovary.
Benefits and problems of controlling fertility
Oral contraceptives
Oral contraceptives allow couples to choose the time they start a family,
and choose the time they stop having children.
However, some women who take the pill may suffer from changes in
weight, mood and blood pressure, as a result of the hormones in it.…read more

Page 6

Preview of page 6

Here's a taster:

For example, they may want a girl if they have lots of boys in
the family, or they may wish to avoid producing a baby with an inherited
defect.…read more


No comments have yet been made

Similar Human Biology resources:

See all Human Biology resources »See all resources »