- Utra filtration takes place in the Bowman’s capsule.
- The efferent arteriole is narrower than theafferent arteriole ; making pressure in theBowmans capsule high. High pressure causes ultrafiltration to occur within the glomerulus ;
- The filtrate consists of urea, glucose, amino acids, mineral salts and water ;
- Large molecular particles such as plasma proteins and blood cells are not filtered ;
- In the proximal convoluted tubule useful substances such as glucose, amino acids, some water and vitamins ; are
selectively reaborbed into the blood by active transport and diffusion ;
- Selective reabsorption uses energy provided by the mitochondria found in cells lining the tubules ;
- In the loop of Henle, salts are reabsorbed into the blood by active transport ; water isreabsorbed by osmosis ;
- In the distal convoluted tubule, hydrogen ions are absorbed from the blood into the urine for excretion. This happens
when there is a high concentration of the ions in the blood ;
- Reabsorption of salts occurs under the influence of aldosterone ; and reabsorption of water occurs under the influence of the anti-diuretic hormone ; in the distole convoluted tubule salt and water are reabsorbed ; In the collecting duct water and mineral salts are reabsorbed ;
- The urine formed passes into the collecting duct which leads to the pelvis, then to theureter and to the bladder.
- Urea is not reabsorbed into the blood.
- In a healthy person, glucose and amino acids are completely reabsorbed into the blood.
- Reabsorption of water also takes place in the collecting duct by osmosis as the renal fluid flows down.
sharon kalunda answered the question on May 24, 2019 at 10:31
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