Introduction:-
We enjoy the beauty of nature with our eyes, the melodies music with our ears, the fragrance of flowers with our nose, the taste of food with our tongue and feel the cool breeze on our skin. What do we do when suddenly bright light falls on our eyes or a hot utensils is touched by chance? All these situations show just how our senses pick up information and react to them. Our senses aren't just a part of us, they define us.
Nothing in the entire universe of scientific exploration can even come close to matching the ability of our brain to use information sensed by our brain to use information sensed by our eyes, ears, skin, tongue, and nose to produce a rich sensory experience in a matter of milliseconds!
What do our senses do?
Our senses have roles to play. They aid our survival by directing us toward certain informations of our environment that are important for us and influence some activity (called as stimuli). As for example tasty foods draw us towards them and our mouth starts watering.
Stimulation to sensation:-
There are certain conditions, substances etc in nature that trigger the process of sensing them by our body. These are stimulants. Information carried by these stimulants are picked up by certain organs called as receptors present in our sense organs and converted into nerve signals. These are carried to the brain and processed to create a sensation. For example when reflected light (stimulus) from the surface of a green leaf and its surroundings reaches receptors in our eyes, it is converted into nerve signals.
Brain is the centre for all the sensitive activities. It receives information through sensory nerves that bring nerve signals from the sense organs and after interpretation sends off signals through another type of nerves called as motor nerves to parts that are to show the response.
Looking back in history :-
Scientists from ancient times have wondered about the senses. Nearly 2300 years back Plato and then Aristotle mentioned the five senses of humans among which the sense of touch was considered the most important.
Thereafter for over a thousand years no documents regarding the role of senses had been found till Albertus Magnus contribution (around 1220AD).
He was a bishop in a church in Italy, a keen observer of nature and a lover of science who followed Aristotelian ideas, but commented on them for the first time making them accessible for wider academic debate. He mentioned the role of nerves for the first time in the sensation of touch.
Johannes Kepler (1600AD), well known for his contributions to astronomy regarding the rotation and revolution of earth, established the role of eyes as a sense organ.
Sense organs are 5 types there are:-
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