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Beyond the Senses

Sense Organs: Organs that helps us to be aware of our surroundings are known as sense organs.

Receptors: Any cell or tissue sensitive to a selective stimuli are called receptors.


Composed of three layers:

  • Outermost layer- sclera and cornea
  • Middle layer- choroid, ciliary body, iris
  • Innermost layer- retina, with rod cells and cone cells.
  • Just behind the iris, a transparent, biconvex, and elastic structure called lens is present.
  • Rods – Contain rhodopsin pigment tha…

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