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Interactions of Human Systems

Interactions of Human Systems. Chapter 3 How Your Body Works. Body System Connections. Heart and Lungs Work together to carry oxygen to the blood and take carbon dioxide out of it. One of the most important interactions. Heart keeps blood moving so cells stay alive. Feeding Cells.

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Interactions of Human Systems

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  1. Interactions of Human Systems Chapter 3 How Your Body Works

  2. Body System Connections • Heart and Lungs • Work together to carry oxygen to the blood and take carbon dioxide out of it. • One of the most important interactions. • Heart keeps blood moving so cells stay alive.

  3. Feeding Cells • Digestive System • “Disassembly line”. • Digestion is the breakdown of the foods into smaller and simpler molecules that can be used by the cells in your body.

  4. Helping Digestion • Brain signals cells in your mouth to produce saliva. • Enzymes are proteins that help the body carry out chemical reactions. • As food passes to other areas of the body the brain signals for more enzymes to be produced.

  5. Circulation and Digestion • Circulatory system transports blood that provides nutrients for cells. • Small intestine is 4-7meters long, and is lined with villi (small fingerlike projections). • Absorption: When food molecules (nutrients) in the sm. Intestine pass through the walls of the villi into the bloodstream. • Nutrients in the bloodstream are carried throughout the body. • What isn’t absorbed is passed through the body as waste.

  6. Chapter 3 Section 2a Questions • How do the heart and lungs interact? • Why is digestion compared to a disassembly line? • How does the brain help digestion? • What are enzymes? • What does the circulatory system do? • What is absorption? • What happens to material that is not absorbed by the small intestine?

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