1. Hormones and Homeostasis

2. Group work
Look at the graph below:
Can you explain why this happens?

3. Homeostasis - involves maintaining a constant environment in the body
What is Homeostasis?
Homeostasis - involves maintaining a constant environment in the body
Homeostasis makes sure our body has the correct levels of
Temperature
Water
Oxygen
Carbon dioxide
Blood sugar

4. Pancreas What is a hormone?
Hormones are chemical messengers used in the body by the endocrine system.
Hormones are produced by our glands.
Which gland produces the hormone insulin?
Pancreas

5. blood sugar levels in our bodies.
The Pancreas
Insulin controls
Glucose is a sugar needed by cells for respiration.
It is important that the concentration of glucose in the blood is kept at a constant level.
blood sugar levels in our bodies.

6. Changing glucose levels
After a meal the level of glucose in our bodies [increases/decreases]?
After exercise the levels of glucose in our bodies [increases/decreases]?
Why do you think this happens?
I think this happens because

7. Blood sugar – Key words Glucose
Glycogen
Insulin
Glucagon
A sugar used in respiration to make energy
A storage substance made of glucose, it is stored in the liver.
A hormone (chemical messenger) it tells your body to change glucose into glycogen. It is made by the pancreas.
A hormone that tells your liver to change glycogen back into glucose. Also made by the pancreas..

9. Let´s act it out! One pancreas One liver One insulin One glucagon
And lots of glucose/glycogens!

10. What would happen if my pancreas did not produce enough insulin?

11. Symptoms of Diabetes
Thirsty
Tiredness
Glucose in urine

12. Regulation of blood sugar is an example negative feedback
All homeostatic mechanisms use negative feedback to maintain a constant value (called the set point).
Negative feedback means that whenever a change occurs in a system, this automatically causes a corrective mechanism to start, which reverses the original change and brings the system back towards the set point (i.e. ‘normal’).

13. Past paper question!

14. Homework