BIOL 103 Lecture Notes - Lecture 10: Pulmonary Vein, Extracellular Fluid, Imperial Abbey Of Corvey
20 Jun 2016
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42. 4: blood components function in exchange, transport, and defence. *recall: open circulatory system= continuous with fluid that surrounds all of the body cells so will have the same composition. Blood consists of cell components that are suspended in a fluid called plasma. Erythrocyte: o2 transport- anaerobic= more efficient because it does not consume the 02 needed for aerobic cellular respiration. Platelets: pinched-off cytoplasmic fragments of specialized bone marrow cells -structural and molecular functioning in blood clotting. Cut in blood vessel-> proteins that attract platelets=initiate coagulation. Platelets release clotting factors->thrombin (positive feedback on itself to produce more thrombin) ->fibrinogen into fibrin. 42. 5 gas exchange occurs across specialized respiratory surfaces. Gas exchange= uptake of molecular o2 from the environment and the discharge of co2 to the environment. Partial pressure= driving force for gas exchange - gas always diffuses from a region of higher pressure to lower pressure. 42. 7 adaptations for gas exchange include pigments that bind and transport gases.
