BIOL 1503 Chapter : Chapter 42 Circulatory System And Physiology
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Transport (bulk flow): gases, nutrients, wastes, hormones, cells, plasma proteins. Hydrostatic skeletons: cnidarians, worms, etc fluid used to maintain body shape. + as a hydrostatic skeleton limited ability to alter velocity & distribution of flow not as much blood loss. Figure 42. 3 (a) an open circulatory system (b) a closed circulatory system. Turtles, snakes & lizards have a 3-3. 5 chambered heart. Crocs, birds & mammals: 4 chambers & double circulation fig 42. 4 & 42. 5. Figure 42. 4 (a) single circulation (b) double circulation. Fig 42. 6 & 42. 7 part of the heart. Tricuspid valve (mitrle) on right & bicuspid valve on left. Arteries leave the heart( pulmonary artery carries deoxy blood) Coronary artery is first to receive oxy blood to feed the heart. Iso-volumetric contractions: all gates closed then semi lunar open. Sinoatrial node in right atrium for intrinsic beat (normal heart beat) Bundle fibers (his) purkinje fibers at apex then contractions. Av node sends signal to both atria to contract 42. 9.
