what is exactly glomerulus?

A glomerulus is a capillary tuft that performs the first step in filtering blood to form urine.It is surrounded by bowman's capsule  in nephrons of the vertebrate kidney . It receives its blood supply from an afferent arteriole of the renal circulation.

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 out of the capillaries and  into bowman's capsule..

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A glomerulus is a tuft or bunch of capillary that performs the first step in filtering blood to form urine. It is surrounded by Bowman 's capsule in nephrons of the vertebrate kidney. The blood enters into it through an afferent arteriole and drains out of it through efferent arteriole. A glomerulus and Bowman 's capsule constitute a renal corpuscle, the basic filtration unit of the kidney. It performs the first step in filtration and helps to remove excess fluids and soluble material from blood that is collected in the Bowmen 's capsule

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The glomerulus is found in the kidney as part of the nephron. The glomerulus is like a bundle of capillaries. When blood enters through these capillaries small particles are forced out, basically by the pressure of the blood running through. Around the glomerulus are layers of filters which ensure that only certain substances are filtered out of the blood, these include: glucose, water, sodium (Na+) etc. All of the glucose and other important substances are reabsorbed later on down the nephron, so all that is left is water which leaves the kidney down the ureter and is stored in the bladder untill you urinate.

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glomerulus is a tuf of capillaries .it is a part of nephron glomerulus consists of afferent arteriole(brings in blood)and efferent arteriole (takes back the blood)

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