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Name ______________________________________ Date _________ The Digestive and Excretory Systems Unit 1 Lesson 4 Lesson WS Choose the letter of the best answer. 1. When he eats, Eli chews his food carefully. As his teeth mash and crush the food, enzymes in his saliva break the food down into smaller molecules. What function is carried out by his saliva? P50 4. The diagram below shows some structures of the human excretory (urinary) system. A. It is performing peristalsis. B. It is chemically digesting the food. C. It is mechanically digesting the food. D. It is producing bile to break down fats. 2. What is the main function of the excretory system? P53 A. to remove waste from the body B. to regulate and control other body systems C. to obtain oxygen and transport it to all tissues D. to break down nutrients into smaller molecules Which of the structures filters wastes from the blood and regulates the amount of water in the body to maintain homeostasis? P54 3. Which of the following best explains an interaction between the digestive system and the respiratory system? P48 & 39 A. R A. To use the energy in food broken down by the digestive system, the body needs oxygen obtained by the respiratory system. B. S C. T B. The main function of the respiratory system is to control, coordinate, and regulate most of the functions of the digestive system. D. W 5. Which of the following choices arranges the organs in the order in which materials would move through them during digestion? C. Coordination between the respiratory and digestive systems is necessary because the digestive system obtains oxygen needed by the respiratory system. A. esophagus, stomach, small intestine, large intestine D. The digestive system obtains nutrients from the food that is eaten, and the respiratory system transports the nutrients to the brain where they are needed. Lesson Quiz © Houghton Mifflin Harcourt Publishing Company 6 B. stomach, esophagus, large intestine, small intestine C. small intestine, esophagus, stomach, large intestine D. esophagus, large intestine, small intestine, stomach Module C • Assessment Guide