Hormones and Homeostasis

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Presentation transcript:

Hormones and Homeostasis

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

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

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

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.

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......................

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..

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Symptoms of Diabetes Thirsty Tiredness Glucose in urine

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’).

Past paper question!

Homework