What organs make up the Excretory System?


Are located on either side of the spinal cord. They are the size of a fist. The kidneys remove urea, a colourless compound that is released when protein is broken down. Urea along with excess water is removed through the process of urination. Urine is a big indication of the amount of nutrients your body has and lacks. The kidney is composed of two parts the renal medulla and the renal cortex.


They are the functional units of a kidney. You can think of these as the buttons to a remote. Each nephron is a small independent unit. They are located in the renal cortex. Their main function is to regulate the amount of water and other substances that are soluble or able to dissolve. They do this by sucking out excess liquid in the blood and excreting them through urine. This is why nephrons are located in the kidney.

Urinary Bladder

A hollow sack like organ that stores and releases urine it is connected to the the kidneys. A good indication of when your bladder has become full is when you get the sensation to use the bathroom.


Are two tubes that descend from the kidneys and connect to the bladder. It’s main function is to transport urine through multiple organs.


A tube that connects the urinary bladder to the genitals. This is how we are able to remove urine from our body. In females the urethra is located above the vaginal opening. And only urine comes out of this. While in men the urethra is much longer and carries both urine and sperm. The Urethra also has an external sphincter that allows us to control urine. In other words, we can urinate even before our bladders are full.


Respiration (the act of breathing) is essential to our body because it gives the cells in our body the necessary energy that it needs in order to function. Waste is eliminated in the form of carbon dioxide. Which diffuses out from the cells in our body entering the bloodstream than being released through the lungs through exhalation.


The excretory system is responsible for removing sweat from the body. Sweat is released from the pores in your skin. Sweat contains several metabolic waste including salt and urea The sweat glands are able to receive wastes because they interact with the capillaries. The capillaries are tiny blood vessels that waste can diffuse out of and be released in the form of sweat.


The liver interacts with all the major organs of the excretory system. The liver’s main role in the excretory system is to break down toxins that enter our body. For example, the liver takes the poisons from ammonia and converting it into urea. This is wear the kidney’s role comes into play because the kidney filters the urea.