why do veins have thin walls as compared to arteries

The arteries carry blood from the heart while veins return blood to it. With both, their structure is related to their function. In order to see this content you need to have both enabled and installed. Visit
Blood in the arteries is under high pressure generated by the heart. The arteries have: thick layers of muscle and elastic fibres.

The blood in veins is under lower pressure than the blood in arteries. The veins have: thin layers of muscle and elastic fibres. Unlike arteries, veins have one-way valves in them to keep the blood moving in the correct direction. The function of capillaries is to allow food and oxygen to diffuse to cells while waste is diffused from cells.

Capillaries have thin walls - only one cell thick - that allow them to effectively perform their function. 1. Cell Introduction 2. Cell Structure 3. Membrane Structure 4. Membrane Transport 5. Origin of Cells 6. Cell Division 1. Metabolic Molecules 2. Water 3. Carbohydrate Lipid 4. Protein 5. Enzymes 6. DNA / RNA Structure 7.

DNA Protein 8. Cell Respiration 9. Photosynthesis 1. Genes 2. Chromosomes 3. Meiosis 4. Inheritance 5. Genetic Modification 1. Species Ecosystems 2. Energy Flow 3. Carbon Cycling 4. Climate Change 1. Evolution Evidence 2. Natural Selection 3. Classification 4. Cladistics 1. Digestion 2. The Blood System 3. Disease Defences 4.

Gas Exchange 5. Neurons Synapses 6. Homeostasis 1. DNA Structure 2. Transcription 3. Translation 1. Metabolism 2. Cell Respiration 3. Photosynthesis 1. Xylem Transport 2. Phloem Transport 3. Plant Growth 4. Plant Reproduction 1. Meiosis 2. Inheritance 3. Speciation 1. Antibody Production 2. Movement 3. The Kidney 4. Sexual Reproduction

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