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Excretory System Functions

Excretory System Functions - expelled from the insect...

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Excretory System Functions 1. Collect water and filter body fluids. 2. Remove and concentrate waste products from body fluids and return other substances to body fluids as necessary forhomeostasis . 3. Eliminate excretory products from the body. Invertebrate Excretory Organs Many invertebrates such as flatworms use a nephridium as their excretory organ. At the end of each blind tubule of the nephridium is a ciliated flame cell . As fluid passes down the tubule, solutes are reabsorbed and returned to the body fluids. Body fluids are drawn into the Malphigian tubules by osmosis due to large concentrations of potassium inside the tubule. Body fluids pass back into the body, nitrogenous wastes empty into the insect's gut. Water is reabsorbed and waste is
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Unformatted text preview: expelled from the insect. Vertebrates Have Paired Kidneys ALL vertebrates have paired kidneys. Excretion is not the primary function of kidneys. Kidneys regulate body fluid levels as a primary duty, and remove wastes as a secondary one. The Human Excretory System The urinary system is made-up of the kidneys, ureters, bladder, and urethra. The nephron, an evolutionary modification of the nephridium, is the kidney's functional unit. Waste is filtered from the blood and collected as urine in each kidney. Urine leaves the kidneys by ureters , and collects in the bladder . The bladder can distend to store urine that eventually leaves through the urethra ....
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