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Excretory system. By Gregory Jones and Francis O’Brien. What is the Excretory System. The excretory system, also known as the urinary system, gets rid of any liquid or gas waste. The excretory system includes: 2 kidneys t he bladder 2 ureters t he urethra. Kidneys.

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excretory system

Excretory system

By Gregory Jones and Francis O’Brien

what is the excretory system
What is the Excretory System
  • The excretory system, also known as the urinary system, gets rid of any liquid or gas waste.
  • The excretory system includes:

2 kidneys

the bladder

2 ureters

the urethra

  • Kidneys filter waste out of the blood.
  • Blood enters the kidneys through the renal artery, and exits out through the renal vein.
  • Any waste collected flows down the renal hilus to the ureter, and eventually to the bladder.
  • Waste is filtered in the glomerulus, found in the renal cortex of each kidney.
  • Blood stays in the artery, but waste filters out of the glomerulus into Bowman’s capsule.
  • Waste exits Bowman’s capsule into the urine collecting duct, which leads to the renal hilus.
  • The bladder is where urine is stored until ready to be excreted.
  • Urine flows into the bladder via the ureters, and exits out via the urethra.
  • An average adult male bladder can hold 17 fl oz.
  • The bladder stretches like a balloon as it fills with urine.
  • When full, the bladder sends nerve signals to the brain.
  • To release urine, the external sphincters relax, opening up the end of the bladder, allowing urine to release.
excretory disorders
Excretory Disorders
  • Incontinence: When the body doesn’t have control of the sphincters, causing urine to leak out.
  • Kidney Stones: When salt and calcium crystalize in the kidney, which can lead to an infection.
  • Bladder Tumors: Usually caused from smoking, can lead to difficulty urinating, infection, or hematuria, which is when blood is found in urine.
  • Polycystic Kidney (PKD): When pockets of fluid form inside one or both kidneys, causing them to irregularly enlarge, and lose the ability to filter blood.

Kidney Stone

Bladder Tumor


  • http://alexandria.healthlibrary.ca/documents/notes/bom/unit_2/ribkid_images/no1.gif
  • http://www.womenshealthzone.net/bladder/urinary-incontinence/anatomy-physiology/img/1036.gif
  • http://www.sciencephoto.com/image/255105/530wm/M1340545-Bladder_cancer,_X-ray-SPL.jpg
  • http://www.theloosh.com/blog/wp-content/uploads/2012/03/Kidney_Stones_Diagram.jpg
  • http://images.medicinenet.com/images/Government/PolycysticKidney.jpg
  • http://biochem.co/wp-content/uploads/2010/01/urinary-system-diagram.jpg