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The Digestive System For this section, please read following pages out of the two different textbooks… the Science Focus 8 Textbook Pages 146 149, The Science in Action 8 Textbook Pages 127 – 131. Use these two sources to help you answer the following questions. 1. Total out of /86 Use the paragraph at the top of page 127 in the Science in Action 8 Textbook to fill in the blanks below. Living organisms require ____________________ to survive. Like other animals, you obtain energy from different sources such as _______________________ (sugars & starches), /5 ____________________ (fats and oils) and ______________________. But before your cells can use any of these energy sources for fuel, they must be _____________________ by your ____________________ system. Your digestive system is in charge of ____________________ down the ________________ you eat into parts __________________ enough to be used by your ______________________. 2. There are two main types of digestion… what are they and what do they involve? 1 ___________________________ /4 2 ___________________________ % 3. The digestive system is actually a long tube within the body that allows food and nutrients to pass through it. Starting with the mouth, outline the order/path of organs that food travels through as it passes through your digestive system? Mouth __________________ /5 ___________________ ________________ _____________________ _____________________ 4. The diagram below shows all of the parts of the mouth which is the first part of the digestive track. Label each of the parts in the diagram and follow up with a short description as to what each one does as well as whether it helps with chemical or mechanical digestion. A _____________________ B _____________________ A C ______________________ /10 B C D D ______________________ E ______________________ E 5. /1 To the right is a diagram that shows how food is pushed through the digestive track. What is the scientific name of this process? ____________________________________ 6. Using the Science in Action 8 Textbook, please label all of the following organs on the diagram below. 7. Using the Science in Action 8 Textbook and reading pages 128 -130 in detail, write a detailed description as to what each of the organs within the digestive system does. Include whether the part helps with “Chemical” or “Mechanical” digestion, if it produces any enzymes, and if/what type of nutrient is broken down at that stage (i.e. proteins, fats/lipids, or sugar/starches) or if it just helps in transporting the food. Finally, explain where nutrient absorption takes place and how. ( 2 marks for each description) /7 Mouth - Salivary Glands - Epiglottis – Esophagus – Stomach – Liver – Gallbladder – Pancreas – Small Intestine – Large Intestine – 8. What are Microvilli and how do they work? 9. On page 149 of the Science Focus 8 Textbook you will find 2.31 of a villus. Draw out that diagram and explain where villi are found and how they connect the digestive system to the circulatory system. /3 /3 10. Imagine you have just eaten a cheese burger. In point form (at least 10 points), describe the path of the cheese burger through your digestive system and the mechanical and chemical digestion that occurs to the food as it is broken down. /20 11. For each of the terms below, explain the relationship that exists. a) Digestion & Enzymes /6 b) Nutrients & Villi c) Digestion & Peristalsis 12. Explain how the small intestine, which fits into a fairly small space in the body, manages to have such a large surface area to help it absorb food nutrients.