BIOL 200 Lecture Notes - Lecture 2: Hemolymph, Cardiovascular Disease, Aorta
13 Apr 2020
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Cellular organism exchange gases across the cell membrane by diffusion. Too large for diffusion i. require cardiovascular system. Transport - oxygen , nutrients , waste products , immune system cells + hormones in blood . Protection - defense against infection by pathogens. * animals no system - flatworms t cnidarians. Open - no distinction between circulating fluid and the interstitial fluid (cid:8869) ex : hemolymph - nutrients , gases , waste products. Closed - circulating fluid , interstitial fluid are kept completely separate . ventricle t atrium. Fishes - 2 - chambered heart with single circuit of flow. Mammals t birds - 4 - chambered heart 2 circuits of flow. Right i left atrium t 2 ventricle. Amphibians - 3 - chambered heart 2 circuit flow u right i left atrium t ventricle pulmonary circuit blood pumped to lungs where oz is picked up systematic circuits blood pumped to tissues of body oz = delivered.
