BIOL371 Study Guide - Gastrovascular Cavity, Buccal Pumping, Respiratory System
22 Jul 2014
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O2 diffusion from seawater into cells of organism a: co2 diffusion from cells out into seawater. Skin breathing" is used by several groups of vertebrates and invertebrates. Compare/contrast cutaneous respiratory strategies as used by frogs and earthworms. Used in combination with gills or lung. Limits size: describe the ways that gas exchange surfaces can be ventilated, and the relative efficiency of each, non-directional ventilation, medium flows past gas exchange surface in unpredictable manner, ex. Unidirectional ventilation very efficient, low energy cost. Must use energy to recover evap loss: compare / contrast ventilation in a squid versus a lamellibranch mollusc. Eulamellibranch gills = thin, flat, ciliated, fused together sheet-like gills. Water passes through ostia (pores) and into water tubes that. Use muscular contraction to propel water into mantle cavity and through the gills via countercurrent ventilation. Compare/contrast how this is achieved in these two groups: gas exchange in the mammal consists of four stages of alternating convection and diffusion.
