The nephron is the part of the kidney that
actually does the filtering of the blood. About 1 million nephrons are found in the cortex of the kidney. It is responsible
for the reabsorption of water and salts. This is also where glucose is absorbed back into the body. The nephron is made up
of many different parts including:
Artery – Blood from the cortex enters into the nephron.
– carries the blood to the Bowman’s capsule.
– Containing the glomerous, where all of the filtration occurs.
A Twisted bunch of small tubes where the blood will pass through. This is semi-permeable to allow for the re-absorption of
salts and water. There are hormones called Aldosterone that are secreted by the brain to tell the glomerous just how much water is needed in the blood
supply. The glomerous only allows what is needed to be re-absorbed. The salts and water, as well as glucose needed is re-absorbed
out of the glomerous, and the rest of the waste, including toxins, is excreted as urine. Only 1 thousandth of the blood circulating
through your kidneys on any given day will be turned into urine.
PASSAGE WAY FOR RE-ABSORPTION
Efferent Arteriole - If something is to be re-absorbed into the body,
it will exit the bowman’s capsule using this arteriole.
Medullary Plexus – A network
of capillaries that take the filtered blood from the efferent arteriole to the intralobular vein.
Intralobular vein – Takes filtered blood out of the nephron back into the kidney to be re-absorbed by
THE PASSAGE WAY
FOR THE URINE:
tubule – This is where the urine leaves the glomerous. It brings the urine to the Loop of Heinle. More re-absorption
occurs in this tubule.
Loop of Heinle
– A U-turn in the tubule which also carries urine away from the nephron. This leads to the distal convoluted tubule.
tubule – Brings urine along to the collecting duct.
Duct – Collects urine and passes it into calyces then to renal pelvis reservoir to be expelled down the ureters.