The Excretory System

Emily Mrkvicka Science 7

Location of Excretory System

The excretory system is located in the torso part of the body which is made up of the lungs, kidneys, bladder, liver, ureters, and large intestine.

Main Function

The main function is getting rid of wastes from the body.

The Kidney

The kidneys are bean-shaped organs. The function is that they extract waste from blood.

4 Functions for the System

  • Eliminates useless by products excreted from cells
  • Eradicate harmful chemical buildups
  • Maintain a steady, balanced chemical concentration in the body
  • To pass waste out of the body

The Bladder

Types of Tissue (4 layers):
  • Epithelium Lining (1st lining-inner)
  • Lamina (2nd lining)
  • Muscularis Propria (3rd lining)
  • Perivesical soft tissue (final lining)
3 Functions:
  • Stores the waste from the kidneys
  • Gets rid of the waste- empties
  • It is kept shut so it won't leak


  • Affects 10% of people living in developed countries
  • Scientists believe the bacteria may break through the mucus layer, that protects the stomach from acids
  • This lets the acid destroy tissue in the stomach lining
  • the result, ulcer
  • Symptoms are dull pain in stomach, weight loss, not wanting to eat because of pain, nausea or vomiting, and heartburn
  • Antibiotics are used to treat it
  • Surgery may be needed to fix scar tissue or a hole in the stomach well
Inflammatory Bowel Disease (IBD)-
  • Refers to a group of illnesses that cause the intestines to become inflammed
  • One form is Crohn's
  • Affects about 1 million Americans
  • Symptoms are fever and fatigue, abdominal pain and cramping, reduced appetite, and unintended weight loss
  • Treatments are anti-inflammatory drugs, antibiotics, and surgery
  • The inflammation of one or both kidneys
  • in the organs of the body gets affected through autoimmune disorders
  • It is causes by the inflammation of the first part of nephron, called glomerulus
  • Symptoms are blood in urine and lower abdominal pain
  • It can be treated by antibiotics and steroids
Urinary Tract Infection-
  • Infection of the ureters, bladder, and urethra
  • Occurs more in women than men
  • Caused by many bacterial infections
  • Symptoms are pain and difficulty while using the restroom
  • Can be treated with antibiotics

Could Someone Live Without A Part of th System?

  • Someone could live with only one kidney
  • They can also live without a bladder

How Does This Organ Interact With Other Systems?

  • It is close partners with the circulatory and endocrine systems
  • Interacts with digestive system, both work with nervous system
  • Circulatory system brings the blood to the kidneys where they filter out the waste