Question

classification of receptors

•by modality

•orgin of stimulus

•by distribution

what are some examples of this ?

Answer 1

Classification of receptors:

1.Based on modality:

i) Exteroceptors: Present in skin and subcutaneous tissue concerned with change in external environment close to body.

Eg: Cutaneous sense organs.

ii) Interoceptors: They detect change in internal environment of the body.

Eg: Baroreceptors and Osmoreceptors.

iii) Proprioceptors: Provide information about position of body in space at given time.

Eg: Present in muscles, tendons and joints.

iv) Teleceptors: Receive stimuli or sensations that are present far away from the body.

Eg: Auditory receptors that detect sound from distance.

2.Based on origin of stimulus:

i) Mechanoreceptors: Respond to application of a nechanical stimulus.

Eg: Merkel's discs, Ruffini endings, Pacinian corpuscles, Meissner's corpuscles, Krause's end-bulbs, Free nerve ends.

ii) Thermoreceptors: Sensitive to changes in temperature of skin.

Eg: Warmth receptors, Cold receptors.

iii) Nociceptors: Responds to painful stimuli that are harmful to organism.

Eg: Thermal receptors, Chemical receptors.

iv) Chemoreceptors: Respond to chemical stimuli.

Eg: Taste receptors, Olfactory receptors.

v) Photoreceptors: They responds to light.

Eg: Rods and cones of retina.

3.Based on distribution:

i) Superficial: Receptors located on skin.

Eg: Touch receptors and Pressure receptors.

ii) Deep: Present in muscles, bones, tendons etc.

Eg: Golgi-tendon organ.

iii) Visceral: Receptors located in viscera.

Eg: Visceral pain receptors.