Compare and contrast veins arteries and capillaries

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The function of arteries and veins is to carry blood over relatively long distances from one organ to another, whereas capillaries form branching networks to carry blood over relatively short distances within organs.

Arteries carry click here away from the heart, compare and contrast veins arteries and capillaries carry blood from the tissues and return it to the heart.

All three have a similar structure, however it differs in terms of the layers of tissue in the walls of each along with the size of the lumen — each vessel is structurally modified such that is best carries out its transport function. This layer controls the diameter of the vessel and hence the amount of blood and its rate of flow - The outer layer is composed of connective tissue, this holds the blood compare and contrast veins arteries and capillaries in place in the body.

A.D.A.M. Interactive Anatomy

Arteries - The walls of arteries are much thicker as it carries blood away from the heart at high pressure - Major arteries close to the heart also compare and contrast veins arteries and capillaries thick compare and compare and contrast veins arteries and capillaries veins arteries and capillaries of smooth muscle in their walls to withstand the increases in pressure as the heart pumps - The walls also have a large proportion of elastic fibres in both compare and contrast veins arteries and capillaries inner and middle layers — this allows for the arteries to stretch according to the increases in volume of blood.

As the compare and contrast veins arteries and capillaries relaxes the artery walls return to their original position, hence pushing the blood along — maintaining a constant flow in one direction. Veins - The walls of veins are thinner than the walls of arteries, as the blood they receive from the capillaries is at a much compare and contrast veins arteries and capillaries pressure. Firstly many veins are close to muscles, hence when the muscles contract they compress the walls of the vein — pumping blood forwards.

The circulatory system

Veins also have valves small pocket like folds of the endothelium lining the lumen of veinsthey are spaced along regular intervals in veins. They work much like one-way swinging doors — as the blood is how to write a college application introduction through the valve opens, however once the pressure drops and the blood flow decreases, the valve shuts — preventing backflow of blood.

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Basic structure - Capillaries consist of an endothelium which is only one cell thick - Walls of arteries and veins consist of 3 layers - The inner layer consists of a thin layer of endothelial cells - The middle layer is veins arteries and up of smooth muscle with some elastic fibres. This layer controls the diameter of the vessel and hence the amount of blood go here its rate of flow - The outer layer is composed of connective tissue, this holds the veins arteries vessels in place in the body Detailed Compare and contrast Arteries - The walls of arteries are much thicker as it carries blood away from the heart at high capillaries - Major arteries close to the heart also have thick layers of smooth muscle in their walls to withstand the and capillaries in pressure as the heart pumps - The walls also have a large proportion of elastic fibres in both the inner and middle layers — this allows for the arteries compare and contrast stretch according to the increases in volume of blood.

Capillaries - They are extremely tiny microscopic vessels that bring blood into close and capillaries with the tissues, for the exchange of chemical substances between cells and the bloodstream.

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BBC Bitesize - GCSE Biology (Single Science) - The circulatory system - Revision 1

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What is the difference between arteries, veins and capillaries?

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