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The three organs of excretion are:

1) Kidney- the kidney goes through 3 stages. Filtration occurs in the glomerulus where the blood enters the afferent arteriole and is filtered and filtrate passes through the glomerulus membrane and diffuses into the tubules but the blood exits through the efferent arteriole. Reabsorption is the 2nd step. This is when glucose, amino acids and water is reabsorbed back into the blood. Step 3 is secretion. The remaining filtrate in the tubules exit through the collecting duct to the renal pelvis to the ureter to bladder.

2) Bladder- the bladder is a muscle so it can stretch to hold about a pint of urine. When it time to urinate the bladder contracts and the urine is sent to the internal sphincter and then the external sphincter.

3) Skin- every time you sweat you are excreting waste

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Chanel Huels

Lvl 13
3y ago

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