BISC 101 Lecture Notes - Lecture 18: Extracellular Fluid, Hypertension, Hemolymph
11 Feb 2018
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Document Summary
Circulatory fluid = hemolymph; actively pumped around the body. 1 or more (tubular) hearts + incomplete blood vessels. Hemolymph not confined to blood vessels; it flows into open sinuses. Directly bathes tissues and organs (interstitial fluid) Low pressure system = slow o2 delivery = low cost. Body movements (e. g. wings, legs) contribute to pumping and return of blood to heart. Confined to blood vessels so separate from interstitial fluid which bathes tissue. 1 (or more) hearts pump blood in closed series of blood vessels infiltrating tissues (as capillaries) High blood pressure increases effectiveness and regulation of o2 delivery in larger, more active animals. Capillaries: small and extremely thin walled (1 cell thick) (cid:272)a(cid:374) (cid:271)e (cid:862)fe(cid:374)estrated(cid:863) (cid:894)holes(cid:895) whi(cid:272)h is where exchange occurs via diffusion i(cid:374) (cid:862)(cid:272)lose (cid:272)o(cid:374)ta(cid:272)t(cid:863) with every cell in the body. 0. 1mm = short diffusion distance + large sa. Some tissues have only 5-10% of their capillaries with blood flowing through regulated by:
