7 Complete the following crossword puzzle. 2 4 5 6 8 9 Across 1 This type of mutrient is the main source of energy 7. digests fat into fatty The enzyme acids and glycerol. 2. are used to make enzymes. 8. contains glands that secrete The gastric juice. 3. The nutrient mostly found in food such as meat, is needed for cell 9. Digestion ends in the small 4. speed up chemical reactions, Down 1. Before the body can make use of large, complex molecules of food, they have to undergo 5. The is also known as the gullet. 6. prevent the body from losing too much heat. Human Digestive System 41