Page 1 - Microsoft Word - Sense organ and Eyes

CHAPTER-9 NERVOUS SYSTEM
Topic: Sense organ and Eyes

SENCE ORGANS

 Sense organs are specialized organs that help to perceive the world around us.
 They are an integral part of our lives and it is the only way that enables us to perceive the
environment.
 Sense organs provide the required data for interpretation through various organs and a
network of nerves in response to a special physical phenomenon. These senses govern our
association and our interaction with the environment.

We have five sense organs, namely:

 Eyes

 Ears
 Nose
 Tongue
 Skin

 These five sense organs contain receptors that relay information through the sensory nerves
to the appropriate places within the nervous system.

https://byjus.com/biology/sense-organs/

Eyes – Sight or Ophthalmoception
 These are the visual sensory organ in our body.
 These are sensitive to light images.
 The eyes vary in colour depending upon the amount of melanin present in our body.
 It helps in the sense of sight by detecting and focussing on the light images.
 The human eye consists of different parts, they are
a) Cornea: the circular transparent area present in the front portion of the eye. Light
enters through the cornea.
b) Iris: is the coloured part.
c) Pupil: the opening in the centre of the iris is called pupil.
d) Lens: a clear lens is present just behind the pupil.