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How Structure and Function of Squamous Epithelium, Erythrocytes and Blood Vessels is Related

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How Structure and Function of Squamous Epithelium, Erythrocytes and Blood Vessels is Related Blood vessels transport cells such as erythrocytes, whilst tissues such as squamous epithelium which have a protective function, enable substances to be transported from one area to another more efficiently. The process, by which substances are transported in this case, is by diffusion. Diffusion is the net movement of materials from an area of higher concentration to an area of lower concentration. The relationships between the factors affecting diffusion are presented in Fick's law of diffusion: Rate of diffusion Surface area Difference in Concentration Diffusion Distance Fick's law states: * The larger the surface area and the difference in concentration, the faster the rate of diffusion * The greater the diffusion distance, the slower the rate of diffusion Diffusion occurs between most cells, and tissues in the body. Squamous epithelium produces a smooth lining surface; it lines vessels such as arteries and veins and also allows diffusion to take place through the wall of capillaries. ...read more.


The capillaries are only one cell thick and made of squamous epithelium. They are permeable to water and solutes allowing exchange of materials between the blood and the cells. According to Fick's law, the larger the surface area, the faster the rate of diffusion. Capillaries are extensively branched to allow the greatest surface area to volume ratio. There is no muscle or elastin in the capillary wall keeping it as thin as possible to lessen the diffusion distance and as a result speed up the rate of diffusion. By being so narrow, red blood cells can just about squeeze through the capillaries as they are of the same diameter. This slows the blood flow allowing more time for diffusion to take place. Arteries and veins consist of the same types of tissues but with different functions. The first layer is the endothelial tissue which contains a high proportion of squamous epithelium. This thin inner lining layer enables blood to flow smoothly through the vessels without causing friction. ...read more.


The squamous epithelium, in particular plays a very important part in enabling exchange of materials through boundaries. They are all suited to their function and have distinctive features that permit the exchange of materials. Additionally, all three are specialised to meet the factors that affect the rate of diffusion. They erythrocytes and the squamous epithelium provide a large surface and are thin to provide a short diffusion distance which is beneficial for diffusion to occur. Capillaries also have an extremely large surface area so that materials can be exchanged efficiently. As they are involved in transporting blood, arteries ands veins have to be relatively strong if the blood is of high pressure like in arteries. Therefore they are adapted by having a collagen outer layer to prevent them from bursting. All these features enable the cells, tissues and vessels to be regimented in their varied roles and functions. ?? ?? ?? ?? AS Biology-Structure and function of squamous epithelium, erythrocytes & blood vessels ...read more.

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