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Elastic Muscle Reduces Explain Structures Walls Arteries Arterioles

Front Explain how the structures of the walls of arteries and arterioles are related to their functions. ( 6 marks)
Back Elastic tissue 
1 Elastic tissue stretches under pressure/when heart beats; 
2 Recoils/springs back; 
3 Evens out pressure/flow;
Muscle
4 Muscle contracts; 
5 Reduces diameter of lumen/vasoconstriction/constricts vessel; 
6 Changes flow/pressure;
Epithelium 
7 Epithelium smooth; 
8 Reduces friction/blood clots/less resistance;

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