Presentation on theme: "Where on the diagram would the following take place?"— Presentation transcript:
1 Where on the diagram would the following take place? 1. glycogenesis 2. gluconeogenesis 3. glycogenolysis Now explain each term.glycogenolysisgluconeogenesisglycogenesis
2 Continue with questions from last lesson. Extra info: The hepatic portal vein is a blood vessel that conducts blood from the gastrointestinal tract and spleen to the liver. This blood is rich in nutrients that have been extracted from food, and the liver processes these nutrients; it also filters toxins that may have been ingested with the food. The liver receives about 75% of its blood through the hepatic portal vein, with the remainder coming from the hepatic artery proper. The blood leaves the liver to the heart in the hepatic veins.
3 What is the difference between Type 1 and Type 2 Diabetes?
5 Glucose as an energy source Boardworks GCSE Science: BiologyControlling Blood SugarGlucose as an energy sourceGlucose is a type of sugar used by the body to provide energy.Sometimes there is too much glucose in the blood, and sometimes there is not enough.What affects the level of blood glucose?eating causes blood glucose levels to risevigorous exercise causes blood glucose levels to fall.The amount of blood glucose therefore needs to be regulated.How does the body do this?5
6 Boardworks GCSE Science: Biology Controlling Blood Sugar Blood glucose levelsBlood glucose rises just after eating, but quickly returns to normal.Where does the sugar go, and why is it not left in the blood?normalafter mealafter vigorous exercise14012010080604020blood glucose (mg/100cm3)Teacher notesThe excess glucose is converted to glycogen and stored, as explained on the next few slides. It is not left in the blood as high levels upset the osmotic potential of cells, which can be very dangerous.6
7 The hormones of the pancreas Boardworks GCSE Science: BiologyControlling Blood SugarThe hormones of the pancreasBlood glucose levels are controlled by the pancreas.pancreasIf blood glucose levels are too high, the pancreas releases the hormone insulin. This makes the liver convert glucose into glycogen, which is stored in the liver and muscles.Teacher notesBefore revealing the arrow and label, the students could be asked to find the pancreas in the diagram. The role of the pancreas in digestion might also be mentioned.This content is higher tier for OCR Gateway Science and Edexcel Science.If blood glucose levels are too low, the pancreas releases the hormone glucagon. This makes the liver convert glycogen into glucose, and release it into the blood.7
8 Maintaining a safe blood glucose level Boardworks GCSE Science: BiologyControlling Blood SugarThis content is higher tier for OCR Gateway Science and Edexcel Science.8
11 How does diabetes affect the body? Boardworks GCSE Science: BiologyControlling Blood SugarTeacher notesType 1 and 2 diabetes used to be called ‘early’ and ‘late onset’ respectively. These terms are used less these days, in part because the increase in childhood obesity has meant that people are developing type 2 diabetes earlier in life.11
12 Use the information provided to fill in the table. Use your knowledge and understanding from the passage, plus your textbooks and notes to answer the two questions.
13 2. too much sugar in the blood and not enough in the cells for energy 2. too much sugar in the blood and not enough in the cells for energy. Affects water potential and cell stability in terms of structure by osmosis.