1. Hormones regulate the human body functions

2. Hormones 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. Bodily reactions to hormones are usually slower and longer lasting than nervous reactions.

4. Hormones produced by glands and their target organs
ovary
oestrogen
ovaries, uterus
progesterone
uterus
pancreas
insulin
liver
testes
testosterone
male reproductive organs

5. Sex hormones
Changes occur at puberty because of sex hormones produced by the testes in boys, and the ovaries in girls.
Changes that happen to both boys and girls: pubic hair grows and underarm hair grows
Changes that happen to boys only:
voice breaks - gets deeper
hair grows on face and body
body becomes more muscular
testes and penis get bigger
testes start to produce sperm cells
Changes that happen to girls only:
hips get wider
breasts develop
ovaries start to release egg cells - periods start
Fertility in humans can be controlled by the artificial use of sex hormones, including contraceptive pills and fertility drugs.