PNB 2250 Lecture Notes - Lecture 6: Buccal Pumping, Electric Eel, Gar
13 Sep 2016
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Document Summary
Lungfish: air-breathers, lungs & gills, 6 species remaining in africa, south america, australia, over 100 million years" old, can grow to be 4-6 feet in length. Dolphins: marine mammals, have true lungs, presence of blow holes is like the nose for us. Allows for breathing through top of head: higher number of alveoli, greater flow of blood to the lungs. With each breath, 80-90% of air is exchanged. Goldfish: air-gulper, extract oxygen in the digestive tract, swim bladders, many goldfish swim to the surface to gulp air when ambient oxygen is low, driven by hypoxia, mostly tropical/freshwater. Warm water has less gas than cold water: use their skin, mouth, stomach, intestine, swim bladder, and lungs. Gills are also utilized for oxygen intake: mudskippers. Eels: crawl over land, gills inflate with air or swim bladder, tolerate severe oxygen debt, breathe through skin, enough oxygen to allow movement over land, electric eel. Return to the surface every 10 min.
