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THE EXCRETORY SYSTEM

THE EXCRETORY SYSTEM. MARY CLAIRE PADDOCK. THE PURPOSE. HIDDEN THROUGHOUT YOUR BODY ARE DANGEROUS POISONS THAT MUST BE REMOVED IN ORDER FOR YOU TO SURVIVE. THE PROCESS OF EXCRETION INVOLVES FINDING AND REMOVING WASTE MATERIALS PRODUCED BY THE BODY. . THE ORGANS INVOLVED.

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THE EXCRETORY SYSTEM

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  1. THE EXCRETORY SYSTEM MARY CLAIRE PADDOCK

  2. THE PURPOSE • HIDDEN THROUGHOUT YOUR BODY ARE DANGEROUS POISONS THAT MUST BE REMOVED IN ORDER FOR YOU TO SURVIVE. THE PROCESS OF EXCRETION INVOLVES FINDING AND REMOVING WASTE MATERIALS PRODUCED BY THE BODY.

  3. THE ORGANS INVOLVED • THERE ARE SEVERAL ORGANS THAT WORK TOGETHER IN THE EXCRETORY SYSTEM INCLUDING THE KIDNEYS, URETER, BLADDER, AND URETHA.

  4. THE PROCESS • BLOOD IS SUPPLIED TO THE KIDNEYS BY THE RENAL ARTERY. ONCE THE BLOOD ENTERS THE KIDNEYS, THE FILTERING PROCESS BEGINS. WATER AND OTHER WASTE PRODUCTS ARE REMOVED FROM THE BLOOD BY MICROSCOPIC STRUCTURES WITHIN THE KIDNEYS CALLED NEPHRONS. EACH KIDNEY CONTAINS OVER ONE MILLION NEPHRONS. THIS ORGAN IS ABOUT THE SIZE OF A HUMAN FIST.

  5. THE KIDNEY

  6. THE PROCESS • THE WASTE FILTERED FROM THE BLOOD FORMS A LIQUID CALLED URINE. THE KIDNEYS FUNNEL THE URINE INTO THE BLADDER ALONG TWO SEPARATE TUBES CALLED URETERS. URETERS ARE TUBES MADE OF SMOOTH MUSCLE FIBERS THAT PROPEL URINE FROM THE KIDNEYS TO THE BLADDER. IN ADULTS, URETERS ARE USUALLY 25-30 CM LONG AND 3-4 MM IN DIAMETER.

  7. THE URETER

  8. THE PROCESS • FROM THE URETERS, THE URINE IS FUNNELED INTO THE BLADDER. THE BLADDER STORES THE URINE UNTIL MUSCULAR CONTRACTIONS FORCE THE URINE OUT OF THE BODY THROUGH THE URETHA. EACH DAY, YOUR KIDNEYS PRODUCE ABOUT 1.5 LITERS OF URINE. ALL OF IT NEEDS TO BE REMOVED FROM YOUR SYSTEM. WHEN EMPTY, THE BLADDER IS ABOUT THE SIZE AND SHAPE OF A PEAR.

  9. THE BLADDER

  10. THE PROCESS • THE RENAL VEINS DRAIN THE KIDNEYS AND CARRY THE FILTERED BLOOD TOWARDS THE HEART. They connect the kidney to the inferior vena cava. Because the inferior vena cava is on the right half of the body, the left renal vein is generally the longer of the two.

  11. THE EXCRETORY SYSTEM

  12. INTERACTING WITH OTHER SYSTEMS • ALL BLOOD THAT CIRCULATES THROUGHOUT THE BODY PASSES THROUGH ONE OF THE TWO KIDNEYS. THE EXCRETORY SYSTEM CLEANS THE BLOOD OF WASTE PRODUCTS PRODUCED BY THE SKELETAL, MUSCULAR, DIGESTIVE, RESPIRATORY, CIRCULATORY, AND NERVOUS SYSTEMS.

  13. BIBLIOGRAPHY • http://www.biology4kids/files/systems excretory.html • http://www.cic-carcas.org/departments • http://www.fi.edu./learn/heart/systems • http://www.teachnet.com/lessonplans/science/biology/theexcretorysystem • http://www.webmd.com/urinary/bladder • http://www.wikipedia.org/wiki/renalartery

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