The Urinary and Excretory Systems

Our body needs food and oxygen to produce energy.  Our body produces waste products.  The body needs to collected and properly disposed waste products. 

The Excretory System

  • Removes wastes from our body is the work of one of the body systems.
  • The kidney, Skin, Large Intestine and lungs help remove the different wastes, the by-products of the different activities of our body.  wastes in our body includes excess water, carbon dioxide, excess salts, nitrogenous compounds, and undigested food.

Excretion is the process of removing wastes from our body.


The Urinary System

  • It is an important part of the excretory system.
  • It consists of the kidneys, ureters, urinary bladder and urethra.


  • Are the two bean-shaped that are found on each side of the spinal column.
  • These are the major organs of the urinary system
  • kidney function is to filter impurities from the blood and regulate the water level and chemicals in the body.

kidneys are composed of about a million nephrons-  it is the  functional unit of the kidney.  that filters  and eliminates                wastes from the body.

The filtration of waste that left in the kidneys found in the urine.  It has metabolic wastes such as excess water, excess salts, and the nitrogenous compounds urea and uric acid.   The urine goes to the ureters.  These are tubes attached to each kidney that lead to the urinary bladder.   In the urinary bladder, the urine stored temporarily.   When the urinary bladder is full of those metabolic wastes, it contracts and urine moves from the bladder going to the urethra and goes out of the body.

The Large Intestine

Not all foods that we take are being digested and absorbed by our body.  The function of large intestine is to absorb water from the remaining undigested foods.  The undigested food is passed into the large intestine and store temporarily.  The undigested food has a large amount of water and dissolved minerals like iron, calcium, and magnesium.  Some dissolved minerals and waters are absorbed by the walls of the large intestine and returned to our body by means of blood circulation.  After absorption, the remaining solid waste become feces.  Feces also known as “excrement” or stool.  It is a waste product from our digestive system that includes bacteria.  It is discharged by the large intestine through the rectum.  It then leaves our body through the anus.


The Skin

  • Removes metabolic waste from the body cells like water, heat, salt at urea.
  • Through the capillaries into the sweat glands, the metabolic wastes move out of the blood vessels.  Each sweat gland has a tube that leads to the pore – a small opening in the skin’s surface.  This is where water and salt pass out of the skin.  These wastes are collectively called sweat or perspiration.

The blood vessels help the skin remove the excess heat from our body.  The blood vessels in the skin dilates when hot, and  the skin releases the heat into the surroundings.

The blood vessels in the skin contract, when cold, it moves the blood away from the skin’s surface.


The Lungs

  • Lungs are the essential respiration organ and an organ for excretion.
  • It removes carbon dioxide and water vapor as waste products and bring oxygen to the blood.
  • It is paired organs in the chest that are protected by the rib cage.


One Response to The Urinary and Excretory Systems

  1. lily says:

    you do not have much information
    i want to know the different ailments in the urinary system with its cause,sympton and treatment thats all.

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