Lecture 44-Water

Lecture 44-Water - Lecture 44- Water -Water is the ultimate...

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Lecture 44- Water -Water is the ultimate electron acceptor. It is fundamental to life on earth. Castor canadensis -Early in spring, the water levels in a river are high enough that the entrance to the lodge is underwater, so predators can’t get in. -Dams control water to ensure their home is safe. In an Organism -Osmotic balance is essential and intimately involves water. Two basic states: organisms that live on water, and those that live on land. -As a habitat, water is dense and produces support. Animals that live on land require another means of support such as a skeleton. -Marine boney fish live in an environment (salt water) that is more concentrated than their body fluids; therefore, they face a problem of dehydration. -Fresh boney fish are more concentrated than the environment in which they live (fresh water), so they face a problem of flooding. They produce vast amounts of urine to compensate. -Water diffuses out of marine boney fish and into fresh water boney fish. Gills are usually the main window for water loss/entry. Diffuson Fick’s First Law: dS/dt = - D A dC/dx -Where dS/dt is the rate of transport -D is the diffusion coefficient -A is the area over which diffusion occurs -dC/dx is the concentration gradient
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This note was uploaded on 04/04/2009 for the course BIOLOGY 1222 taught by Professor Haffie during the Spring '09 term at UWO.

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Lecture 44-Water - Lecture 44- Water -Water is the ultimate...

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