Lect.12vascularsystem - Transport in Many Animals Not All...

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Transport in Many Animals
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Not All Organisms Have a Transport System
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Relying on Diffusion www.science.siu.edu Microsoft Corporation www.microbeworld.org www.nmfs.noaa.gov
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- Open Circulatory System--> Mollusks and arthropoda - Closed Circulatory System --> Vertebrates
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Circulatory System: Open
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Mollusks Heart has 3 chambers : 2 Atria and 1 ventricle Atria receive hemolymph from gills Ventricle pumps oxygen rich hemolymph to other tissues Hemolymph pigment contains copper. Pigment is called hemocyanin Hemocyanin transport oxygen and is bluish color (true blue bloods) Exception, Squid and Octopus
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Arthropoda Tubular heart pumps hemolymph into blood vessels (arteries) that delivers to sinuses. Some have accessory valves “hearts” to help pump hemolymph to extremities such as wings.
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Vertebrates Similar in fish, frogs, reptiles, birds, and mammals. All have ventral, muscular heart that pumps blood into a closed system, this system consists of: Heart
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