Digestive and Excretory Systems

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Digestive and Excretory Systems
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Vocabulary Lesson 3

• 1. digestion is the process of breaking down
  food into a form your body can use
• 2. nutrients are substances in food that the
  body needs to work properly

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• 1. What happens in your mouth?
• a. Teeth chop and grind food into smaller pieces
• b. Chopped food mixes with saliva that helps
  break down food

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• 2. What happens in your esophagus and stomach?
• a. After swallowing, food goes to the esophagus
• B. Food then enters the stomach, which is a
  hollow, muscular organ that breaks down food
• i. Glands in the stomach make acid and other
  digestive juices
• ii. The walls squeeze food and mix it with juices
  to form a thick liquid

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• 3. What happens in your small and large
  intestines?
• a. Food enters the small intestines after the
  stomach (90 of all nutrient absorption occurs
  here) the small intestine is 1 inch in diameter
  and about 22 feet in length. Food takes 3-5
  hours going through it

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• b. not all food can be digested in the body
  those parts pass to the large intestines
• i. takes most of the remaining water out of food
  and forms solid waste removed during a bowel
  movement
• ii. Eating food with water and indigestive
  materials, like fresh fruits and vegetables help
  the large intestine empty regularly

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Review Lesson 3

• What does the digestive system do?
• What happens to food in the stomach?
• How do the materials in food get to the cells of
  your body?

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Vocabulary Lesson 4

• 1. kidneys two bean-shaped organs that remove
  most of the extra water and cell wastes from your
  blood
• 2. urine the liquid waste filtered from the
  blood by the kidneys
• 3. carbon dioxide gas that is a waste released
  by the lungs
• 4. perspiration sweat contains salt and
  extra water

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• How does liquid waste leave your body?
• a. Skin - Sweat glands remove water, salt, and
  other waste from the blood in the form of
  perspiration, or sweat
• b. Kidneys scrub your blood of cell waste and
  create urine
• c. Lungs releases carbon dioxide which is a
  cell waste released when you breathe out
• The excretory system helps keep wastes from
  remaining in your body, which keeps your cells
  healthy

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Review Lesson 4

• What is the job of your excretory system?
• What does your urinary bladder do?
• How do the sweat glands remove wastes from your
  body?