BIOL 3114 Lecture Notes - Lecture 7: Shoulder Girdle, Synovial Membrane, Hyaline Cartilage
20 Oct 2016
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Document Summary
Air lacks support provided by water: new support systems for. Gills do not function in air: modifications for gas exchange. Gill lamellae collapse without support of water. Gas exchange most efficient across a moist membrane. Move it deep within body to combat desiccation. Thermoregulation is more important because air is thermally less stable: behavioral and physiological endothermy. Vibration and light move through air differently sensory systems must function differently: air offers less obscured/distorted visual environment, long distance vision now possible, vibrations (sound) do not pass through animal as easily, loss of electroreception. Tetrapod = vertebrate with 4 limbs adapted for walking: limbs may be secondarily modified for other forms of locomotion, e. g. , swimming, climbing, flying, limbs may be secondarily reduced or lost. Origin of tetrapod limbs: most likely adaptations to life in shallow water, attachment of pelvic girdle to vertebral column. Support: distinct neck with separation of pectoral girdle from opercular bones. Mobility of head for feeding, sensory, respiratory functions.
