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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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13y ago
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13y ago

They would be the liver, the kidneys, and the lungs

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11y ago

skin

liver

kidney

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Q: What are the three most important organs in the excretory system?
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