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BIOL 1010 (76)
Chapter 26

BIOL 1010 Chapter 26: Topic 26.6

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University of Manitoba
Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

O98729 Bio 1010 Capillaries – transfer blood between arteries and veins within each tissue. Open systems Consists of many invertebrates (including most molluscs and all arthropods) Fluid is pumped among the tissues and there is no distinction between circulatory and interstitial fluids. Instead this fluid is called hemolymph and has the functions of both blood and lymph. The vertebrate circulatory system is often called the cardiovascular system Arteries don’t always carry oxygen-rich blood, and veins do not always carry oxygen-poor blood. Capillaries are the places where exchange occurs. There is not any complicatedsystemforexchange;itismostlyachievedthroughdiffusion. The key differences between the open and closed system is the vessels in an open circulatory system do not form an enclosed circuit from the heart, through the body, and back to the heart, and the circulatory fluid is not distinct from interstitial fluid, as is the blood in a closed circulatory system. – Vertebrate cardiovascular systems reflect evolution As aquatic vertebrates became adapted for terrestrial living, breathing capability went from gills to lungs, which also lead to the closed circulatory system development. Single circulation Double circulation
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