BIOL10004 Lecture Notes - Lecture 15: Hemolymph, Pneumothorax, Surface Tension
30 Jul 2018
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Body surface: gases diffuse into cells via body"s surface invertebrates & Tracheae: gases enter tracheae & diffuse into cells do not enter. Lungs: two way air flow terrestrial invertebrates. Air & water as respiratory media capillaries first- insects. Gas exchange- supply of o2 & removal of co2. Occurs b/w animals & environment via air/water. Water: greater density, more viscous, greater resistance to diffusion of o2 and co2 pressure. Capacity of water for o2 is far lower than co2. Conc of o2 in 1l of air: 20. 9% (more than co2) Conc os o2 & co2 in water depends on solubility of gas & its partial. Capacity of air for o2 & co2 identical. At equilibrium with air water holds 20x less air. O2 replenishment assisted by ocean currents- salty water. Fresh water o2 content can be maintained if sufficient circulation. Mitochondria: utilisation of o2 within cytosol by mitochondrial. Once in solution: o2 diffuses across membrane barriers if there is a.
