The most wonderful machine in the world is the human body. It is able to perform many functions at any given time.
There are different organs in our body that have specific functions. Our nose is used to smell things; our ears help us to listen to our favorite music; our eyes to see this beautiful world; our legs help us to walk, and run; our hands help us to hold things, write, etc. Some of these organs we are able to see and some we are not able to see
The organs that we are able to see are known as external organs. For example hands, legs, head, nose, eyes, ears, mouth, etc.
The organs that we are not able to see which are inside our body are known as internal organs. For example brain, heart, lungs, stomach, kidneys, etc. Internal organs do not work individually
Many organs group together to perform a specific function. When a group of organs works together to perform a specific function, it is called the Organ System.
Some of the organ systems that perform various functions in our body are:
1. Digestive System
2. Respiratory System
3. Circulatory System
4. Excretory System