Lecture 6 - Cardiovascular and Respiratory Systems

Soluble in water and its environmental concentra7on

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Unformatted text preview: t of gas at a par7cular volume depends on pressure •  Diffusion limits animal size –  Larger by evolving flat, thin body –  Larger by having a thin body built around a center cavity 5 Body surfaces for gas exchange 6 Adapta7on for gas exchange •  Oxygen can be obtained more easily from air than from water –  Oxygen’s solubility in water is low –  Amount of oxygen in water decreases with temperature and al7tude (less supply of oxygen) •  CO2 is soluble in water and its environmental concentra7on is low; therefore it is easier to eliminate 7 Adapta7on for gas exchange 8 Water ­Breathing vs. Air ­Breathing •  Different challenges to gas exchange •  Aqua7c animals –  Have less oxygen available –  When temperatures change in water, oxygen availability also fluctuates –  Moving water through respiratory membranes takes more effort •  Water is denser than air – it removes heat from gill surface and can create osmo7c movement •  Terrestrial animals –  Have to manage with desicca7on of respiratory membranes 9 Adapta7on for gas exchange •  Adapta7on to gas exchange –  Increase surface area •  Internal and external gills •  Lungs •  Trachea 10 Bulk flow •  The gas exchange occurs by a combina7on of ven7l...
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This document was uploaded on 03/05/2014.

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