01:119:116 Lecture Notes - Lecture 24: Adrenal Medulla, Basal Lamina, Stethoscope
24 Apr 2016
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42. 1-42. 3: animals that don"t need circulatory systems. Remember: all animals exchange with environment, via diffusion in/out of cells. Cnidarian- digestive and circulatory digestive system because cavity (2 layers of cells) Circulatory fluid, set of interconnecting vessels, muscular pump (heart: 2 types. Low pressure- relatively inefficient (can"t replace depleted o2 fluid) All have same basic structure- cardiovascular system: blood- will discuss next time, blood vessels- 3 types (arteries, veins, capillaries) Capillary bed: network of capillaries, infiltrate all tissues. Veins vs. arteries: direction of blood flow, not o2 content: heart. Comparison of vertebrate circulation: fish- single circulation. O2 rich blood travels slowly (can go fast if you decrease area where it comes out . thumb on hose) Low metabolic rate in fish (ectoderm: amphibians- double circulation. Mammalian circulatory system 42. 5: human heart, cardiac output vol blood/min by left ventricle. = heart rate x stoke volume heart rate= beats/mins stroke volume= volume pumped/contraction: 4 valves.
