BIOL 206 Lecture 16: 206 Transporters
Document Summary
Plants utilize a passive mode for transporting solutions, often producing high pressure potentials within rigid conducting elements. Xylem-dependent phloem-loading: animals use an active mode of transport, and non-rigid conducting elements. Volume/diameter: blood vessels will collapse if there is no blood in them (for the most part. Large arteries are an exception. : worm has closed circulatory system with muscular blood vessels that squeeze to keep blood flowing in system, in many cases animals expend energy for circulatory system, plaque buildup in arteries decrease compliance. Ex: when first blow up a balloon, stretch it so it will blow easier. That is compliance: animal circulatory system purpose= mix extracellular fluid up, bigger and more complex/ more specialization in tissue= bigger need to mix up circulatory system, plant transport occurs in vascular tissue. Uptake by roots, transport via xylem, loss to the at(cid:373)osphe(cid:396)e. ((cid:449)hat is(cid:374)"t take(cid:374) up (cid:271)y (cid:396)oots lost th(cid:396)ough open stomata_ Mechanism of water entrance into roots cells-diffusion of water (osmosis)
