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8Ad(8) Digestion 2 The Fab Food Company makes a sandwich called a ‘Healthy Delight’. It contains bread, butter, celery and ham. 1 Write down the main food substance contained in: a bread b butter c ham. 2 Do you think the ‘Healthy Delight’ is healthy? Explain your reasoning. 8 A d Fats, oils and sweets – you should only have these as an occasional treat. Dairy products (things made from milk) contain fats and proteins. Meat, fish, beans, eggs and nuts contain lots of protein. Fruits and vegetables contain lots of minerals, vitamins and fibre. 3 ‘Stringy’ vegetables, like celery, contain a lot of fibre. Fibre is not digested by the body. Write down, in order, the names of the organs that the fibre passes through when it is eaten. Bread, cereal, rice and pasta contain lots of starch. 4 The table shows the names of some enzymes, what they do and where they are found. Amylase from the salivary gland is destroyed in the stomach and so another amylase is added in the small intestine. Enzyme a Where are ‘salivary glands’ found? b Where do you think most digestion happens? Explain your reasoning using the table above. Where it is found What it breaks down amylase salivary glands starch lipase small intestine fat pancreatic amylase small intestine starch pepsin stomach protein trypsin small intestine protein c Copy the table below. Put ticks in the boxes to show which part of the ‘Healthy Delight’ sandwich will be digested in the various parts of the digestive system. There can be more than one tick for each food. Bread Butter Celery Ham mouth gullet stomach small intestine d What do digestive enzymes split starch into? e What pH do you think pepsin works best at? Explain your answer. f What temperature do you think lipase works best at? Explain your answer. I CAN... • describe what happens in the stomach and small intestine • describe what conditions enzymes work best in • explain what digestion is. Exploring Science M01_EXSC_CM_Y8GBR_2506_UA.indd 39 edition 39 © Pearson Education Limited 2008 21/8/08 11:33:57