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Gas Exchange

Gas Exchange. By Ben Howard, Margaret Ciocca, and Nellie Stoeckle. Alveoli. Site of gas exchange through diffusion Very thin walls, coated with thin film water Problem: water molecules more attracted to each other than the air (surface tension) Very Abundant - 300,000,000

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Gas Exchange

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  1. Gas Exchange By Ben Howard, Margaret Ciocca, and Nellie Stoeckle

  2. Alveoli • Site of gas exchange through diffusion • Very thin walls, coated with thin film water • Problem: water molecules more attracted to each other than the air (surface tension) • Very Abundant - 300,000,000 • Area of 75 square meters • http://www.bmu.unimelb.edu.au/examples/gasxlung/

  3. Major Functions of the Respiratory System • Oxygen uptake • Carbon dioxide removal • Supplies blood with oxygen so blood can supply tissues with oxygen

  4. How it Works • http://www.biosolutions.info/2008/10/gas-exchange-in-lungs.html • Exchange alveoli-capillary through simple diffusion

  5. Composition of Blood • Straw-colored plasma (90% water) with suspended cells • Red blood cells • White blood cells • Platelets

  6. Plasma • 55% blood volume • Liquid portion of blood • Houses many things • Electrolytes • Vitamins • Nutrients • Even more: • Hormones, clotting factors, proteins, immunoglobulins

  7. Red Blood Cells • 99% of cells in blood • Principal carriers of hemoglobin • Picks up oxygen in lungs, delivers • 4 heme groups surrounding a globin group • Can pick up 4 oxygens • Discotic shape

  8. White Blood Cells • Part of Immune System • Also “cleaning ladies” - remove dead cells and debris • Dead white blood cells build up, become pus • AIDS results is a reduced white blood cell count

  9. Blood Platelets • Sticky, so form clots to stop bleeding • Calcium and Vitamin K needed to clot

  10. Bibliography • Bianco, MD, Carl. "How Your Heart Works." How Stuff Works. 10/30/08. HowStuffWorks, INC, Web. 9 Nov 2009. <http://health.howstuffworks.com/heart.htm>. • Freudenrich, Ph.D., Craig. "How Your Lungs Work." How Stuff Works. 10/30/2008. HowStuffWorks, INC., Web. 9 Nov 2009. <http://health.howstuffworks.com/lung.htm>. • Verma, Ajay Mark. "Anatomy and Physiology of Respiratory System Tutorial." The Virtual Autospy. University of Leicester, Web. 9 Nov 2009. <http://www.le.ac.uk/pathology/teach/va/copy.html> • "Respiration." Human Physiology. Web. 9 Nov 2009. <http://people.eku.edu/ritchisong/RITCHISO//301notes6.htm>. • Starr, Cecie, and Ralph Taggart. Biology: The Unity and Diversit of Life. 9th ed. Pacitic Grove,CA: Brooks/Cole, 2001. 88-89. Print.

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