Lecture 6 - Cardiovascular and Respiratory Systems

Heart direct supply of blood to 7ssue vessels

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Unformatted text preview: of lung cancer each year alributed to smoking –  Long ­term smoking is the major cause of emphysema 27 Pulmonary condi7ons •  Emphysema –  Reduced blood oxygen and poor lung func7on –  Over 85% of cases are due to smoking –  Involves extensive lung damage –  Reduces elas7c quality of lungs and total surface area of alveoli 28 •  BREAK! Circulatory system •  Purpose: To transport things along the body •  Composi7on: muscular pump (heart), a fluid (blood) and series of conduits (blood vessels) •  Open circulatory system: extracellular fluid is the same as the fluid in the circulatory system (hemolymph) •  Closed circulatory system: circula7ng fluid (blood) stays within the system –  Need to move the fluid through out the body. The bigger the animal, the higher the pressure to reach every cell 30 Open circulatory system •  Arthropods, mollusks and other invertebrates •  Fluid leaves the vessels, 7ckles through the 7ssue before returning to the heart 31 Closed circulatory system •  A system of vessels circula7ng blood throughout the body separately from inters77al fluid •  Advantage –  Faster –  Tissue control of blood flow –  Specialized cells or molecules can be kept within the vessel and would only act where...
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