There's no reason for it, since it's not.
Your skin however is.
And it is because it converts the different stimuli affecting it into electrical energy and sends the information to your brain, thus allowing you to "feel" it.
And why that is can be answered by the Theory of Evolution.
If you can feel your surroundings your chances of survival increase drastically.
Without the sense organs animals wont be able to sense their enemies. It is believed that today Man is a great threat to the animal kingdom. It is therefore necessary for animals to have sense organs.
sense organ spinal cord and brain
tongue
It's not easy to be sure what is meant here. The sight organ is the eye, and the sound organ is the ear, but these are sense organs, i.e. they contain receptors. The larynx makes sound, and this could be classed as an effector if you shout in response to a stimulus, but you can't really think of sight in this way.
The levels or organization are: cells -->tissues--->organs--->organ systems--->organism. The heart is an organ of the organ system called the cardiovascular system. This includes the heart, veins and arteries and blood.
The skin is both a sense and excretory organ.
-- The organ of the sense of sight is the eye, including the optic nerve. -- The organ of the sense of hearing is the ear, including the middle and inner ones. -- The organ of the sense of smell is the nose and the olfactory nerves. -- The organ of the sense of taste is the tongue and its taste buds. -- The organ of the sense of touch is the skin and its nerve endings.
Skin
A sense organ is an organ of the 6 senses. The sense organs and senses are: the eyes--sight the nose--smell the tongue--taste the ears--hearing and balance the skin--touch
hearing
is a smoke detector like a sense organ
There is no sense organ beginning with the letter U.
is a smoke detector like a sense organ
The brain is a organ. The brain is the organ that receives messages from the six senses; the touch sense, the seeing sense, the hearing sense, the smelling sense and the tasting senses. If you are asking 'Is the brain the largest organ?' Well, no. The largest organ is not the brain, or the chest, or the stomach. It is the skin.
The sense organ that is used for reading are the eyes.
Sense organ of sight, smell and touch
Your organ in the brain used for smelling.