Excretory System The system that excretes waste from the body.

Sponge Water flow through the sponges orifice and pores caries out the waste. Any mineral particles, that enter the sponge through the water flow system, that threaten to block the sponge, are transported through the mesohyl (a gelaatious matrix within the sponge) and are generally dumped into the outgoing water current.

Earth Worm

Frog The organs in the frogs execratory system are the: Kidneys Ureters Bladder Cloaca Along with all of these organs, frogs also exchange substances just like mammals through their skin. An example of this would be water. The Frogs excretory system starts by liquid wastes traveling from the kidneys to the ureters then to the urinary bladder. The solid wastes however pass into the cloaca from the large intestine. Both of these waste materials leave the body through the cloaca and the cloacal vent.

Human Wastes that are removed in the human excretory system are; carbon dioxide, water, urea, and uric acid. All these wastes that are excreted travel through the blood stream at some time. Organs of the human Excretory System and their function are: Lungs – remove excess carbon dioxide. Liver – produces urea and uric acid as a by-product of the breakdown of proteins. Skin – Removes excess water, salt, urea, and uric acid through sweating. Aorta – Starts on the left side of the heart and sends blood to main parts of the body. Including the kidneys. Urinary System (bladder, kidneys, ureters) – The kidneys filter the blood to form urine containing excess water, salt, urea, and uric acid.

Sources: l l AAEDvYJ AAEDvYJ %20102/bio%20102%20lectures/animal%20diversity/lower%20i nvertebrates/sponges.htm %20102/bio%20102%20lectures/animal%20diversity/lower%20i nvertebrates/sponges.htm Body-The-Excretory-System Body-The-Excretory-System