Hormones are chemical messengers produced by endocrine glands that control various bodily functions like growth, metabolism, and development through negative feedback loops. They travel via bloodstream and have longer-lasting effects than nerve impulses. Examples of glands that produce hormones include the pituitary, thyroid, adrenal, pancreas, ovaries, and testes, with hormones regulating processes such as blood sugar levels, mood, and sexual maturation.

1. Hormones

2. Aims
• To know that our bodies are
controlled by hormones.
• To understand that different
hormones affect different parts of our
bodies in different ways.

3. What is a hormone?
• Hormones are
chemical
messengers used in
the body by the
endocrine system.
• They co-ordinate our
organs.
• Hormones are
produced by glands.

4. Hormone controls.
• Hormones travel slower
than nerve impulses but
have a longer lasting
effect.
• They are excreted by the
glands and travel in the
blood.
• Hormones stabilise the
body's internal
environment and also
have roles in growth and
sexual development.

5. Hormone controls.
• Hormones control:
• Growth
• Sexual development
• Sugar levels
• Mood
• Metabolism
• Can you think of any
problems that can be
caused by these not
working?

7. Growth hormone problems?!

8. Endocrine glands.
1)Pineal gland
2)Pituitary gland
3)Thyroid gland
4)Thymus
5)Adrenal gland
6)Pancreas
7)Ovary
8)Testis

9. Hormone Regulation
• Hormones are
regulated by
negative
feedback.
• Regulation of
blood sugar is a
good example of
this.

10. Insulin Control
Brain senses high blood
sugar
Pancreas produces Insulin
Glucose stored in liver as
glycogen
Low blood sugar sensed by
brain
Pancreas produces
glucagon
Liver releases stored
glycogen as glucose into
blood