How do we get nutrients from food? Structure and Function of the Digestive System.

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Presentation transcript:

How do we get nutrients from food? Structure and Function of the Digestive System

Teeth: Digestive Organs and the importance of oral health! Tooth decay: sugary foods feed bacteria; who break down the foods and produce acids which eat away enamel. Brushing removes food/bacteria. Baking soda neutralizes mouth!

What other digestive organs help you to get energy from food? Primary Organs: food passes through in the digestive process. Accessory Organs: involved with digestion but food does not pass through.

Mechanical Digestion vs. Chemical Digestion Mechanical digestion: the mashing, crushing, movement of food. Chemical digestion: the enzymatic breakdown of food in the intestines.

Process of obtaining materials from food Ingestion Digestion Absorption Release of wastes

Homeostasis in Digestion Digestion of Proteins in Stomach: –Enzyme pepsin –Functions at pH of 2 –Brain stimulates stomach cells to release HCl and pepsinogen (inactive pepsin) –Low pH activates pepsin to break down enzymes.

Structure and Function: Absorption Villi: folds in the wall of the intestine –Allows for increased surface area. –Food absorbed through wall of intestine into blood vessels.

On your own… Color the human body’s digestive organs. Label the organs as primary or accessory. Match the definitions with the digestive organs and copy them into your organizer. Definitions are available online.