Sense Organs

The five senses are the five main tools that humans use to perceive the world. Those senses are sight, smell, hearing, taste, and touch. We see with our eyes, we smell with our noses, we listen with our ears, we taste with our tongue, and we touch with our skin. Our brain receives signals from each of these organs, and interprets them to give us a sense of what's happening around us. 

What are the functions of the sense organs?

Ears allow us to hear sound - to detect vibrations in the air particles around us. But the inner ear also helps us maintain balance and regulate sinus pressure. This is especially useful when you change altitude (like, for example, when you are flying in an airplane).

Noses are used to smell scents. They get a sense for what particles are traveling through the air, which can help us identify if dangerous chemicals are nearby. Smell also has the strongest connection to memory; a familiar smell can remind us of things long forgotten. 

Eyes obviously allow us to see. But if you break it down, they do more than just that. Using our eyes, we can judge depth, interpret new information, and identify color (the wavelengths of light that reflect off surfaces).

Tongues are used to taste foods, allowing us to figure out if something is going to be useful to our bodies or poisonous. They also allow us to sense hot and cold in food and liquids. 

Last of all is the skin, which is responsible for what may be the most important senses in the human body. The skin performs a huge number of functions. These include:
Perspiration (sweating) to cool the body
Protection from the elements
Sensing what's in contact with our bodies
Communication with other human beings through touch
Storage of water and lipids