BIOA02H3 Lecture Notes - Lecture 18: Abdominal Cavity, Epiglottis, Blood Vessel
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BIOA02H3 Full Course Notes
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Partial pressure of gas: p exerted by a given gas within a gas mixture. Air composition: 78% n + 21% o + 0. 03% co2 + 0. 97% rare gases -> Patmosphere = pall gas + ph2o -> @ sea lv = relative humidity: 0% -> patm = 760 mmhg -> gas partial p gradient move down from high partial p area to low partial p area. Water is 1000 times more dense than air & 50 times more viscous -> 1. Water breathers need to move more water over gills = same amt of o2 2. More energy required to move water over respiratory organ. Active vs passive ventilation: use muscle contraction to move air/water across respiratory exch surface vs gas di usion across respiratory surface w/ x active movement of air/water // lungs & int gills vs ext gills. Tentacle: gas exch & feeding -> water pumped in & out of tube.
