Circulation(3)

Circulation(3) - General Biology 101 Dr. Morrison Lecture:...

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General Biology 101 Dr. Morrison Lecture: Circulation Circulatory Systems Circulatory systems have evolved ways to increase gas transport efficiency Consider features of blood, blood vessels, and heart(s). Gas transport efficiency of blood Only limited amounts of gases can dissolve in blood (a warm, open Coke is “flat”) Respiratory pigments (e.g., hemoglobin) increase carrying capacity of blood for O 2 Red blood cells each contain 250,000 hemoglobin molecules. Open Circulatory Systems Blood bathes the body tissues directly. Blood does not remain inside blood vessels for its entire circuit. There is no distinction between “blood” and “interstitial fluid.” Open circulation in insects See drawing on board. Open circulation in insects Dorsal heart(s) pump body fluids Sluggish flow through body cavities Efficient enough for transport of food and wastes, but not O 2 and CO 2 How are gases transported? Closed Circulatory Systems In which the blood is confined to blood vessels through the entire circuit. There is a distinction between blood and interstitial fluid. Closed circulation in earthworms See drawing on board. Closed circulation in earthworms
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Circulation(3) - General Biology 101 Dr. Morrison Lecture:...

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