Biology 2601A/B Lecture 14: bio 2601 LECTURE 14 animal circulation 1

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Functions of circulatory system: heat, hormones, get rid of waste, offers high pressure system created by pumping of the heart, distribute oxygen. Biodiversity of circulation functional: oxygen is key, speed of transport, diffusion slow, 1mm, bulk flow fast, none, e. g. Cnidaria (jellyfish), platyhelminth (thin organism), porifera (sea sponge: lo(cid:449) pressure s(cid:455)ste(cid:373) that does(cid:374)"t (cid:272)ost too (cid:373)u(cid:272)h (cid:894)u(cid:374)like hu(cid:373)a(cid:374)(cid:895) If there are capillary beds where radius adds resistance that needs to be overcome: open: vessels and heart (dorsal located) but not connected to capillary bed so blood will just pump into interstitial space, e. g. Arthropoda: segmented body, appendages, exoskeleton: hemolymph (a blood like fluid) in a haemocoel (primary body cavity of most invertebrates, closed, e. g. Lo(cid:449) pressure does(cid:374)"t (cid:373)ea(cid:374) the(cid:455) (cid:374)e(cid:448)er e(cid:454)perie(cid:374)(cid:272)e high pressure (cid:271)ut heart is not massively muscular and pumping blood throughout entire system: relatively inefficient, ca(cid:374)"t keep i(cid:374)terstitial fluids a(cid:374)d (cid:271)lood separate, do(cid:374)"t allo(cid:449) i(cid:373)pressi(cid:448)e athleti(cid:272) feats.

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