Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Homeostasis Name:__________ Define homeostasis Homeostasis - involves maintaining a constant environment in the body Homeostasis regulates…. TEMPERATURE/BLOOD SUGAR/WATER/OXYGEN/CARBON DIOXIDE What is a hormone and where are they produced? Hormones are chemical messengers used in the body by the endocrine system. They are produced by our glands. The Pancreas Insulin controls blood sugar level 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. Changing glucose levels After a meal the level of glucose in our bodies increases. After exercise the levels of glucose in our bodies decreases. Why do you think this happens? I think this happens because...................... The body digests the food we eat breaking it down into sugar molecules for absorption (carbohydrates) – this increases blood sugar levels. When we exercise we use glucose for respiration which reduces blood sugar levels. Key words Glucose Glycogen Insulin Glucagon Definition 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. Controlling Blood Glucose Levels Glucose increases (food intake) Insulin causes GLUCOSE to change to GLYCOGEN in the liver Glucose decreases Normal blood Normal blood glucose level. Glucose decreases (exercise) glucose level. GLUCAGON causes GLYCOGEN in the liver to change back to glucose Glucose increases Diabetes Some people suffer from a disease called diabetes. They do not produce enough of a hormone called insulin from the organ in the body called the pancreas. Insulin controls the blood sugar levels. Diabetics have to be careful that they do not eat too much sweet food. They may also need to inject themselves with the hormone insulin to help control their blood sugar level. Negative feedback Explain 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’).