Hormones are chemical messengers produced by glands that travel through the bloodstream and have long-lasting effects on organs and internal systems, controlling processes like growth, metabolism, mood, and sexual development. They work through negative feedback loops to regulate things like blood sugar levels. When glands like the pituitary, thyroid, adrenals, pancreas, ovaries, or testes produce different hormones, they affect different parts of the body and imbalances can cause problems.

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