circulatory

circulatory - 11/22/2011 Circulatory System Chapter 14...

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11/22/2011 1 Functions: Transport material to the cells - Transport material away from cells - Regulation of body systems Homeostasis Thermoregulation Biochemical control Immunological control Tissue repair Circulatory System Chapter 14 Components: Muscular pump Arteries Capillaries Veins Blood Blood as a Tissue Highly specialized connective tissue Living cells (RBCs, WBCs & others) embedded within a non-living matrix (plasma) Plasma: Water Albumins Globulins Fibrinogen Dissolved/suspended salts, etc.
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11/22/2011 2 Blood cells Erythrocytes (RBCs) Leucocytes (WBCs) Nongranular (mononuclear) leukocytes Granular leukocytes Neutrophils Eosinophils Basophils Thrombocytes Spindle cells Platelets Circulatory vessels derived from embryonic mesenchyme All contain endothelium single layer of specialized epithelium no porous openings regulates passage of all material into and out of blood Capillaries smallest division of circulatory vessels represent the functional unit of the circulatory system lumen wide enough for single cell passage highly branched & highly invasive # may increase or decrease depending on need Capillaries represent the functional part of the circulatory system Specialized capillaries: Rete Mirabile specialized capillary network with function other than circulatory Red organ Glomeruli of kidney Heat sensing organ of pit vipers
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11/22/2011 3 Arteries carry blood away from heart under high pressure thick wall, narrow lumen endothelium + 3 tunics tunica intima fibrous elastic tissue tunica media smooth muscle; concentric tunica adventitia loose connective tissue Veins carry blood towards heart under very little pressure thin walls, large lumen endothelium + less well developed tunics may contain one-way valves to prevent backflow Aortic Arch Evolution (Afferent/Efferent Branchial Arteries) Primitive pattern:
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This note was uploaded on 01/17/2012 for the course BIOL 306 taught by Professor Phillipd.sudman during the Spring '12 term at Tarleton.

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circulatory - 11/22/2011 Circulatory System Chapter 14...

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