WS IGCSE Biology DIGESTION Name: __________________ Class: _____________ Date: ________________ Part I. Processes that are involved as the food passes through the alimentary canal. Draw a line to match the term to its meaning. Ingestion a. the removal of undigested food from the body as feces Digestion b. the movement of nutrients from the intestines into the blood Absorption c. uptake and use of nutrients by cells Assimilation d. the breakdown of food Egestion the taking of substances into the body Part II. Physical and chemical digestion. A. Complete the sentences below to distinguish physical digestion from and chemical digestion. Physical digestion is the …………………………………… of large pieces of food into ………………………………… pieces without ……………………………………. the food molecules. Physical digestion increases the ………………………………………. of food for the action of enzymes in chemical digestion. Chemical digestion is the breakdown of the large …………………………………… food molecules into smaller ……………………………………. molecules by the action of ……………………………….. Chemical digestion produces small ………………………………………. molecules that can be absorbed. B. Which organs are involved in physical digestion? ………………………………………………………………….. C. Which organs are involved in chemical digestion? …………………………………………………………………. D. The three types of enzymes in the alimentary canal. Complete the table below to identify the enzyme, substrate and products in the digestive system. ENZYME SUBSTRATE (nutrient it breaks down) 1|Page PRODUCTS lipase amylase protease Part III. The Teeth A. Function of the teeth …………………………………………………………………………………………………………… ……….. …………………………………………………………………………………………………………… ……………………… B. Label the parts of the tooth. C. Identify the part of the tooth that is being described below. ………………………………….. the hard, outer layer of the crown, above the gum ………………………………….. softer, more like bone in structure ………………………………….. it fixes the root of the tooth into a bony socket jaw 2|Page ………………………………….. the part that is below the gum ………………………………….. a space in the tooth containing nerves and blood vessels D. Label the types of teeth below. E. Complete the table to describe each type of teeth. Teeth molars premolars canines incisors 3|Page Shape Function Part IV. Label the diagram below. Use the words from the box. Textbook pages 80-83 anus duodemum esophagus ileum large intestine mouth stomach Part V. On the above, draw the following parts: salivary gland, liver, gallbladder and the pancreas. 4|Page
