* This change in diameter maintains a high filtration pressure which is essential for filtration
* This change in diameter maintains a high filtration pressure which is essential for filtration
* Also the blood entering the afferent arteriole is at very high pressure already as it from the renal artery
* Also the blood entering the afferent arteriole is at very high pressure already as it from the renal artery
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* The pressure actually forces molecules through the '''glomerular filtration barrier''' which is responsible for selectively filtering the blood forming the glomerular filtrate.
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* The pressure actually forces molecules through the [[The Formation of the Filtrate by the Glomerular Apparatus- Anatomy & Physiology#Glomerular Filtration|'''glomerular filtration barrier''']] which is responsible for selectively filtering the blood forming the glomerular filtrate.
* As well as the the cells in the blood vessels the other component of the glomerulus are the mesangial cells:
* As well as the the cells in the blood vessels the other component of the glomerulus are the mesangial cells: