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Blood sugar and Diabetes

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Presentation on theme: "Blood sugar and Diabetes"— Presentation transcript:

1 Blood sugar and Diabetes
Prior learning That sugar is available in the blood as glucose and regulated by the brain, pancreas and the liver Key words insulin, glucagon, liver, pancreas, hypothalamus, negative feedback

2 Some hormones affect only one target organ, but most affect more than one.
When the hormone has had the desired effect, further production of the hormone needs to be controlled. Hormone production is controlled by a process called negative feedback. The regulation of blood glucose level is an example of negative feedback. of 31 © Boardworks Ltd 2004

3 increased blood glucose
The level of glucose in the blood decreases, causing the pancreas to stop producing insulin. Insulin produced by the pancreas tells cells to take insulin from the blood and convert it to GLYCOGEN which is stored in the LIVER increased blood glucose insulin blood glucose returns to normal of 31 © Boardworks Ltd 2004

4 Negative feedback – low blood glucose
The level of glucose in the blood increases, causing the pancreas to stop producing glucagon. Glucagon stimulates the liver to convert glycogen back to glucose and release it back in the blood stream. decreased blood glucose glucagon blood glucose returns to normal of 31 © Boardworks Ltd 2004

5 a Which point, 1 or 2, shows just after a meal was eaten?
1 Look at the graph a Which point, 1 or 2, shows just after a meal was eaten? Explain your answer. b Which point, 1 or 2, shows when insulin was released by the pancreas? Explain your answer. c Between which values does blood glucose concentration normally vary? of 31 © Boardworks Ltd 2004

6 When hormones go wrong – diabetes
Lack of insulin production means that the blood glucose level is unregulated and causes the condition known as “sugar diabetes”. Symtoms of diabetes include; glucose in urine, unusual thirst and lack of energy After a person with diabetes has eaten, their blood glucose level increases. What happens to this glucose? The absence of insulin means that glucose is not converted to glycogen and stored in the liver, so the blood of a diabetic contains extra glucose. of 31 © Boardworks Ltd 2004

7 When hormones go wrong – diabetes
Glucose is essential for the body, so why is excess glucose a danger for people with diabetes? The ability of the kidneys to absorb glucose is also exceeded, so the excess is excreted in urine. When the glucose is used up, coma and convulsions may occur. Regular insulin injections and a careful diet can control the condition. of 31 © Boardworks Ltd 2004

8 a Describe the shape of the curve for the normal person.
2 Look at the graph. a Describe the shape of the curve for the normal person. b Describe the shape of the curve for the diabetic person. c Explain the difference between the two curves. d How much higher has the blood glucose concentration of the diabetic increased beyond the normal range in your answer to question 1c? of 31 © Boardworks Ltd 2004

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10 Movie clip - diabetes

11 1)Explain why diabetes must be treated
1)Explain why diabetes must be treated. Use a graph to explain your answer (6 marks) 2)Suggest which part of the diet needs most careful control for diabetics. Explain your answer (2 marks) 3)Why does aerobic exercise help control blood glucose concentration? (2 marks) of 31 © Boardworks Ltd 2004

12 Task 2: Create a poster that displays the facts about diabetes
of 31 © Boardworks Ltd 2004


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