Glomerulus

Glomerulus is a network of tiny blood vessels, or capillaries, located at the beginning of a nephron in the kidney. The glomerulus is where the first step of urine formation takes place, through a process called filtration.

Structure

The glomerulus is a tuft of small blood vessels called capillaries located within Bowman's capsule within the kidney. The glomerulus receives its blood supply from an afferent arteriole of the renal arterial circulation. Unlike most capillary networks, the glomerulus drains into an efferent arteriole rather than a venule. The resistance of the arterioles results in high pressure in the glomerulus, aiding the process of ultrafiltration where fluids and soluble materials in the blood are forced into the capsule.

Function

The primary function of the glomerulus is to perform the first step in the filtration of blood to form urine. This is done as blood pressure forces water, ions, and small molecules from the blood in the glomerulus into the Bowman's capsule. This mixture is referred to as the glomerular filtrate. The remaining blood cells and larger molecules, such as proteins, pass through the glomerulus and into the efferent arteriole.

Clinical significance

Damage to the glomerulus can lead to glomerular diseases, such as glomerulonephritis and glomerulosclerosis. These diseases can affect the glomerulus's ability to filter the blood, leading to conditions like chronic kidney disease and end-stage renal disease.

See also

• Nephron
• Kidney
• Renal physiology
• Renal function

References

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