Human Excretory System – Organs, Function, Diagrams

Humans generally consume food from various sources every day, and all the nutrients are extracted from this food, and the remaining unwanted components are excreted from the body. And in this process, various organs like Kidney, Urethra, Ureters, and bladders play an active role. Here in the below article, we are going to provide a comprehensive description of the Human Excretory System, its functions, and components, with a detailed diagram. 

What is the Human Excretory System?

The Human Excretory System is a set of special organs of the human body, which play a major role in the removal of nitrogenous and other unwanted wastes from the said body. The various organs of the Human Excretory system are,  

  • Urethra. 
  • Urinary Bladder. 
  • Pair of Kidneys. 
  • Pair of Ureters. 

Functions of Various Organs


A bean-shaped structure located on either side of the backbone is the kidneys. This organ consists of multiple components such as Capsule, Henle’s Loop, and Nephrons. The main function of this organ is to remove wastes such as acids that are actively used during digestion, as well as extra fluids.  

Urinary Bladder

The urinary Bladder is defined as a muscular sac-like structure, that stores urine. And during the process of urination, this bladder is emptied.  


A tube arising from the urinary bladder is commonly used to transport sperm and urine. Sphincter muscles are located at the openings of these tubes, that regulate or guard the flow. 


The thin muscular tube extends from the pair of kidneys and helps in the transport of urine from the kidney to the Urinary Bladder. 

Human Excretory Diagram

Human Excretory Diagram

In the above diagram, you can observe all the different organs in the Human Excretory System Model.  

Functionality of Human Excretory System

As you can guess from the above sections, the Human Excretory System performs various important functions, which we are going to talk about briefly here in this section. 

Urine Formation  

Nephrons are the place where the urine is formed and it is collected at the Urinary Bladder through the tubes called Ureters starting from the Kidneys. 

Glomerular Filtration  

The process of removing excess fluid and waste components from the blood, to store them in the urine collection tubes in the Kidneys is called Glomerular Filtration. 

Tubular Reabsorption  

The process of absorption of ions and molecules, such as Amino acids, water, glucose, sodium ions, etc, through active and passive processes.  


In order to maintain the equilibrium of the various fluids present in the body, such as Hydrogen Ions, Ammonia, and Potassium Ions, the excess quantity of these fluids is secreted out. 


In this article, we have covered all about the Human Excretory System, Excretory Organs, in detail. And complex topics or chapters like these are very common in biology subjects, and they might give a hard time for the students. If you are one of those students then we suggest you join Online Interactive classes offered by various platforms. And if you are looking for Online Home Tutor programs for cost-effective prices and various benefits, then the Tutoroot platform might be a good option for you. 

Frequently Asked Questions

What is an excretory system? 

The excretory system is a set of organs that play an active role in removing all the waste products from the body, after extracting all nutrients from food sources. 

What are the main organs of the excretory system? 

The excretory system has multiple organs like the Kidney, Ureter, Urethra, and Urinary Bladder. 

Which excretory system do we observe in starfish? 

Starfish are the only organisms that do not have any dedicated excretory system or organs. 

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