1. Endocrine or Hormonal System
Year 9 Science
Add slide about difference between endocrine and nervous system

2. Endocrine system
Many endocrine glands form part of the endocrine system
Controls many body activities such as the body temperature, water balance, and growth and our sexual characteristics

3. Endocrine Glands Located in various areas around the body
The pituitary gland plays a major role in regulating and homeostasis and is found below the hypothalamus of the brain
Other endocrine glands include the thyroid gland, pancreas, adrenal glands and sex organs
Many are controlled by the pituitary gland

4. Hormones
Hormones are chemical substances produced by the endocrine glands and act as messengers in the body
Are produced in very small amounts but can have a long-lasting effect
Hormones are released directly into the bloodstream so endocrine glands are referred to as ‘ductless’ glands
Effect of hormones is slower than nerves

5. Hormones
They are transported by the blood and have the potential to reach and affect every cell of the body
Most hormones act or have an effect on only particular parts of the body which are called the target tissue or organ.

6. What makes hormones?
Hormones can either be made mostly from proteins of mostly from fats (steroid hormones)
This has important implications for the mechanism of delivery when a person’s endocrine system requires supplementation

7. Pituitary Gland Is about 1 cm in diameter - the size of a pea
Located at the base of the brain
It is connected to and controlled by the hypothalamus in the brain
Provides a link between the nervous and endocrine systems

8. Pituitary Gland…
Considered one of the most important glands in the body
Releases its own hormones and also controls the activities of other endocrine glands such as the ovaries, testes and the thyroid gland
It directly controls many body activities such as the body temperature, water balance, and growth

9. Example of a negative feedback loop

10. Example of a positive feedback loop – oxytocin