Comparing Transport Systems In Flowering Plants An

September 1997

B io Factsheet
3.

Number 7

Comparing Transport in Mammals and Plants
Multi-cellular organisms need to provide every cell with oxygen, water and nutrients and to do this they need a transport scheme because diffusion would be too slow. The development of a transport corpse is indeed closely connected to an organisms aerofoil line of business:volume proportion. Organisms which have a very large surface bea:volume ratio e.g. protozoans, flowerpot rely upon diffusion, just as an organism wins larger, its surface atomic number 18a to volume ratio decreases and this makes a specialised transport system essential. Transport can be analysed under four headings: 1. The Structure of the Transport brass Transport in both plants and mammals is by a system of specialised tubes. The smallest of these tubes - capillaries - may have a lumen of 5-8µm whilst veins may have lumens of 3cms diameter. In mammals this forms a circulatory system of arteries, capillaries and veins. In flowering plants, transport is not circulatory and occurs in microscopic xylem and phloem. Both transport systems use water as the basis for transport since it is a good solvent, has a game specific heat capacity, is not too viscous and is unreactive (inert).



Both animals and plants have more than one type of tissue paper which is specialised to make transport an efficient process. The vessels and tracheids in xylem be made up of dead, lignified cells. Phloem tubes are living, as are all the mammalian transport cells and tissues. 2. What substances are Transported? In mammals, argument forms the liquid medium of transport. Blood consists of 55% plasma and 45% cells and cell fragments. plasm consists of water, proteins e.g. fibrinogen and inorganic ions, e.g. Na+ and Ca2+. Plasma has several functions: maintains blood pressure; transports the products of digestion - amino acids, sugars, fatty acids, minerals and vitamins to where they are needed; transports waste products of metabolism (excretory products) away from the...If you want to get a full essay, order it on our website: Ordercustompaper.com



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