Repiration and circulation PDF

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Chapter 42
Dr. Benjamin Rohe...

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Lect 9 Respiration and circulatory ● Ventilation movement of air and water through organ ● Diffusion at respiratory surface O2 moves from air or water into blood and CO2 move from blood into air ● Circulation transport of CO and O throughout the body by the circulatory system ● Diffusion at the tissues ● Cellular respiration Partial pressure ● Partial pressure pressure of particular gas in a mixture of gases What affects the amount of gas in solution 1. Solubility of the gas in water 2. Temp of water 3. Presence of other solutes 4. Partial pressure of the gas in contact w the water Law of diffusion ● Ficks law of diffusion states rate of diffusion of a gas depends upon 5 parameters 1. Solubility 2. Temp 3. Surface are 4. Difference in partial pressure 5. Thickness of barrier of diffusion Remember the values of the equation - must be able to manipulate the effects of something changing** Gills ● Gills are outgrowths of bady surface or throat used for gas exchange ● Most fishes ventilate their gills by opening and closing their mouths or operculum, a flap over gills Insects trachea ● Trachea air filled tubes ● They have openings called spiracles ● Bronchi ● Bronchioles ● The organ of ventilation is the lungs Alveoli 1. Thin fluid layer 2. Layer of epithelial cells 3. ECM 4. Wall of a capillary Ventilation ● Two way of pumping air: 1. Positive pressure ventilation: force air into lungs** 2. Negative pressure ventilation: Creating a vacuum, not forcing it in making a space for it to go**

Lect 9 ● Inhalation ● Exhalation Oxygen and carbon dioxide trasnsport ● Plasma ○ Platelets ○ Red blood cells ○ White blood cells Hemoglobin ● Red blood cells contain an oxygen carrying molecule hemoglobin ●...