Hormones and Homeostasis http://www.classjump.com/m/mypscience Group work Look at the graph below: Can you explain why this happens? http://www.classjump.com/m/mypscience What is Homeostasis?
Homeostasis - involves maintaining a constant environment in the body Homeostasis makes sure our body has the correct levels of....... Temperature Water Carbon dioxide
http://www.classjump.com/m/mypscience Oxygen Blood sugar 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 http://www.classjump.com/m/mypscience The Pancreas Insulin controls........ blood sugar levels in
our bodies. 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. http://www.classjump.com/m/mypscience
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...................... http://www.classjump.com/m/mypscience
Blood sugar Key words Glucose A sugar used in respiration to make energy Glycogen A storage substance made of glucose, it is stored in the liver.
Insulin A hormone (chemical messenger) it tells your body to change glucose into glycogen. It is made by the pancreas. Glucagon A hormone that tells your liver to change glycogen
back into glucose. Also made by the pancreas.. http://www.classjump.com/m/mypscience http://www.classjump.com/m/mypscience Lets act it out!
One pancreas One liver One insulin One glucagon And lots of glucose/glycogens!
http://www.classjump.com/m/mypscience What would happen if my pancreas did not produce enough insulin? http://www.classjump.com/m/mypscience Symptoms of Diabetes Thirsty
Glucose in urine http://www.classjump.com/m/mypscience Tiredness 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). http://www.classjump.com/m/mypscience
Past paper question! http://www.classjump.com/m/mypscience Homework http://www.classjump.com/m/mypscience
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Sixteen-year-old Beatrice Prior was born into an Abnegation family, but selflessness has never come naturally to her like it does her brother, Caleb. She feels lonely and constricted by her environment and feels like she doesn't belong. When the time...
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