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Organ systems in Humans

Organ systems in Humans. Chapter 3.3. This year we will look at 3 of the 11 organ systems found in humans; 1. Digestive system 2. Respiratory system 3. Circulatory system. Structures. BLM 3-12. Digestive system. Begins with mouth Salivary glands start breaking down starches.

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Organ systems in Humans

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  1. Organ systems in Humans Chapter 3.3

  2. This year we will look at 3 of the 11 organ systems found in humans; • 1. Digestive system • 2. Respiratory system • 3. Circulatory system

  3. Structures

  4. BLM 3-12

  5. Digestive system • Begins with mouth • Salivary glands start breaking down starches. • Food travels through esophagus, stomach, small intestine, large intestine, rectum, anus • Others that assist: liver, pancreas and gallbladder. • http://www.youtube.com/watch?v=q3986Yfl5cU&feature=related

  6. BLM 3-13

  7. Respiratory system • Air enters through mouth/nose • Goes through esophagus • Continues with larynx, trachea, bronchus, bronchioles, and alveoli (alveolus) • http://www.youtube.com/watch?v=HiT621PrrO0&feature=related

  8. BLM 3-14

  9. Circulatory system • Two parts • A system of tubes that carry blood through body • A “pump”  Heart • Made of blood vessels: • Arteries • Veins • Capillaries

  10. The circulatory system: Video • http://www.youtube.com/watch?v=H04d3rJCLCE&feature=related

  11. Blood Vessels

  12. Page 81 Figure 3.17

  13. Arteries • Carries blood away from the heart to the rest of body • Walls are thick and muscular to avoid collapsing under pressure of pumping blood. • Usually depicted as red (full of oxygen)

  14. Veins • Carries blood back to the heart from the rest of body. • Blood moves slow now because of traveling through body • Walls are thin. • Have valves to stop blood from flowing backwards. • Usually depicted as blue (lacking oxygen)

  15. Capillaries • Connect arteries and veins • Hair thin vessels, walls only one cell thick

  16. Blood

  17. Functions

  18. 1. Digestive system • Breaks down food into small parts.

  19. 2. Respiratory system • Moves air in and out of the body. • The in and out movement of air supplies O2 for cells and removes waste CO2. ( gas exchange)

  20. 3. Circulatory system • Circulates blood around body • Delivers food, dissolved gasses, and other materials • Carries away waste.

  21. Connections between systems.

  22. Page 82 Figure 3.18 (A&B)

  23. Page 82 Figure 3.18 (A&B)

  24. Respiratory and Circulatory • These systems are the 2 main ways in which the needs of each cell are met. • The Resp. Sys. Brings O2 into body and removes CO2 and the Circ. Sys is the road it travels. • The alveoli and the capillaries are where the 2 sys. meet.

  25. Respiratory and Circulatory • The bronchioles of the lungs end in a grape-like cluster of the alveoli. • The purpose of the alveoli is to give a very large surface area for gas exchange to occur.

  26. Respiratory and Circulatory • The alveoli and the capillaries are both very thin walled because O2 and CO2 must diffuse through them. • We breathe in air. It travels to the alveoli. The capillaries wrap themselves around the alveoli and collect the diffused O2 and bring it to the rest of body. • The reverse happens when we breathe out.

  27. Page 84 Figure 3.19

  28. Digestive and Circulatory • Food transfers from Digest. Sys to Circ Sys. in the small intestine. It is lined with hair like things called villi. Each villushas a network of capillaries. • Dissolved food particles pass from the intestine into the capillaries by a process called absorption.

  29. Mechanics of breathing.

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