BIOL-1030 Lecture Notes - Lecture 9: Angioplasty, Abdominal Cavity, Qrs Complex
16 Sep 2016
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23. 1 circulatory systems facilitate exchange with all body tissues. Intro concepts: all cells must receive nutrients, exchange gases and remove wastes diffusion alone is inadequate for large and complex bodies. Most animals, circulatory system facilitate these exchanges. Circulatory system: an organ system that moves various substances to and from the cells of the body. Advanced functions: stabilize ph (via bicarbonate system), temperature regulation, help usually comprised of a heart, blood and blood vessels fight infection. Evolutionary variations in circulatory system no circulatory system cnidarians and flatworms open circ. system snails and crickets closed (one circuit) Worm two chambers (one circuit) frog three chambers (two circuits) frog four chambers (two circuits) The open circulatory system open = blood freely exits the circulatory system, mixes with interstitial fluids, bathes internal organs and tissues, and reenters the system found in arthropods, most molluscs and some invertebrates.
