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Lecture 15

PHGY 210- Lecture 15- Dr. Guevara.docx

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PHGY 210
Ann Wechsler

Lecture Fifteen- Friday, February 5 , 2010h know what’s in the textbook for test: Sections A-E of Chapter 12 (pgs 359-425) Functions of the Cardiovascular System: TRANSPORT  Bringing oxygen from cells to lungs  Bringing fuel to cells (eg glucose from liver to brain)  Bringing nutrients to the body (eg from intestine to the liver)  Removal of waste products (eg Carbon dioxide to lungs, ammonia to liverureakidneys) Waste products are toxic!  Circulation of hormones (eg adrenaline to skeletal muscles)  Circulation of immune cells and antibodies  Regulation of electrolytes  Regulation of pH  Water balance, osmoregulation  Thermoregulation (transport heat from where it’s produced to skin, where it can be released) frostbite: flow of blood to the skin shut down to keep heat in the body Who doesn’t need a Cargiovascular System? Ameoba! (~300 microns across)  no heart or vessels, doesn’t need them due to small size  if they get hungry, pseudopods engulf  in they need oxygen, it diffuses in from water surrounding it  wastes are diffused out as well Single cell of a rabbit ventricle is about 100 microns long. Cardiovascular system has millions of them. Therefore the scale of the cell is almost the same as the scale of the amoeba. Therefore any organism big enough has cardiovascular system. see pictures Diffusion: The spontaneous movement of particles caused by random thermal motion. see picture of diffusion fro heart to lung to heart: Chain of events: convection to bring molecule into alveolus, then diffusion, then convection in cardiovascular system (lungs to body part), then diffusion out. [Partial pressure of oxygen in mitochondria very low] Fick’s Law: Shows you what flow will be, in essence. -The wall of the alveolus is very thin to make diffusion easier. -Edema: coating of water in the alveolus. Now an oxygen molecule must diffuse through water and then the wall, therefore flux is decreased. If it is very severe you will die. Cardiovascular System:  Pump = heart  Pipes = vessels  Fluid = blood Kardia: heart; vas: vessel The Insect Heart:  More simple  Has a long vessel that runs along the ba
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