Why is it an advantage for arteries to have elasticity?
Elasticity allows hormones to travel up AND down the bloodstream easier. (i.e. when the pituitary glands sends GH to the heart and lungs.) without elasticity, we would quickly develop bronchitus after consuming foods or drinks.
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Why do veins seem to have less elasticity than arteries? They are not really, it only seems that way because veins are smaller in diameter and received less of the enzyme that promote elasticity given by an enzyme during growth development which come from skeletal cartilage. A bony cartilage, or cartilage in generals are made up of many cells, that has combines together forming this structure.
During cardiac systole the left ventricle contracts, the semi lunar valves open and occlude the coronary arteries. During diastole the valves close and because of the elasticity of the aorta which has just been stretched blood now flows into the coronary arteries. The reason for this is that it is easier to supply blood to the cardiac muscle when it is relaxed.