BISC 101 Study Guide - Final Guide: Extracellular Fluid, Hemolymph, Perfusion

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Carries transport tissues close contact with every cell in body: describe open circulatory system found in arthropods & molluscs. 1/more tubular hearts + incomplete blood vessels. Low pressure system = slow o2 delivery but low cost. Contraction (vasoconstriction)/ relaxation (vasodilation) of smooth muscles in arteriole walls. Cardiac muscles & smooth muscles controlled by. Local control by endothelium: describe closed circulatory system found in annelids, cephalopods 7 vertebrates. Confined blood vessels (separate from interstitial fluid which bathes tissues) 1/more heart pumps blood in closed series blood vessels infiltrating tissues. High pressure = increased effectiveness of o2 delivery but high cost: describe capillaries, arteries & veins. Small thinned walled ( 1 cell thick) Carry blood from heart tough/thick elastic walls. Recoils = maintain blood pressure in capillaries when heart relaxes. Thinner walled with valves to prevent backflow from low pressure. Amount of blood coming from arteries & arterioles. Simple solutes o2/co2/sugars/salts diffuse across cells or spaces b/w cells.

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