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Excretory System

Excretory System. 1/4/2010. Functions. responsible for the removal of wastes produced by the body while it maintains homeostasis. The removal is known as excretion . It is important for the body to remove these various waste, also known as toxins, because toxins build up can lead to death.

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Excretory System

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  1. Excretory System 1/4/2010

  2. Functions • responsible for the removal of wastes produced by the body while it maintains homeostasis. • The removal is known as excretion. • It is important for the body to remove these various waste, also known as toxins, because toxins build up can lead to death.

  3. Several organs are involved with the excretory system, including the kidneys, sweat glands, lungs, and rectum.

  4. Lungs • Carbon dioxide and water vapor are removed by the lungs.

  5. Kidneys • Other wastes, namely urea, various salts, and assorted nitrogenous wastes, are removed by the kidneys and sweat glands.

  6. Liver • The liver acts as a filter for the blood. • It cleans out toxic waste and acid in the blood.

  7. Other Organs • Feces are removed by the rectum. • The spleen filters out worn out red blood cells, and the lymph nodes filter out foreign cells.

  8. Water • About sixty percent of your body contains water. • A portion of the water is in the tissues and cells. • The water contains salt. • The salt needs to be kept at the right concentrations. • If there is little salt the body feeds it more, if there is too much salt, the body gets rid of the excess. • This is the task of the two kidneys.

  9. Bladder • The urinary bladder usually holds 400–620 ml (1¾– 2 ½ cups) of urine. • The desire to urinate usually starts when the bladder reaches around 75% of its working volume. • If the person is distracted, the need can fade and return with more urgency as the bladder continues to fill. • If the amount of urine reaches 100% of the urinary bladder volume, the voluntary muscle that controls the bladder, becomes involuntary and the urine will be instantly released.

  10. Urinary Tract Diagram • Cut out and label the parts of the diagram. • You may use the textbook, page 455 to help you.

  11. BrainPop

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