Organs Involved in Excretion and the Formation of Urine
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Organs Involved in Excretion
Excretion is the process by which the waste products from cell metabolism are eliminated from the blood.
Kidneys
Kidneys eliminate toxic substances resulting from cell metabolism through the urine.
Lungs
Lungs expel carbon dioxide from cellular respiration.
Liver
Liver produces a liquid called bile that helps to eliminate waste from digestion through feces.
Sweat Glands
Sweat glands, exocrine glands of the skin, are responsible for sweat excretion. Sweat is a liquid that is very similar to urine, but more diluted.
Nephrons and the Formation of Urine
Nephrons are the basic functional units of the kidneys. Each kidney has about one million. Urine is a liquid made of water, salts, and waste. This is done using filtration and reabsorption. About 1.5 liters of urine are produced every day.
Glomerulus
A mass of tiny capillaries through which blood and waste products pass.
Bowman's Capsule
A sac surrounding the glomerulus. Most small molecules like water and salts are filtered into Bowman's capsule from the capillaries.
Proximal Convulted Tubule (PCT)
Useful substances such as glucose, amino acids, ions, vitamins, and filtered water are reabsorbed here.
Collecting Duct
This duct collects urine and channels it into the renal pelvis. From there, urine is transported into the ureter.
Loop of Henle
It reabsorbs ions and some water.
Distal Convoluted Tubule (DCT)
Ions are reabsorbed there.