Question

Match the following. Identify the correct match between set I and set II

Set I	Set II
(A) Caloreceptors	(I) Cold receptors
(B) Proprioceptors	(II) Body surface receptors
(C) Frigidoreceptors	(III) Heat receptors
(D) Exteroceptors	(IV) Receptors found in muscles

A) A- I, B- II, C- III, D- IV
B) A- III,B- IV, C- I, D- II
C) A- IV, B- III, C- II, D- I
D) A- III, B- IV,C- II, D- I

Answer 1

Hint: Living organisms have their own ability to respond to different stimuli. Sensory receptors of humans are highly evolved. Stimulation of these receptors initiates the transmission of a nervous impulse to the brain, where sensory information is analyzed and interpreted.

Complete Step by Step Answer:
Thermoreceptors are the receptors that respond to the changes in the temperature. These are of two types-
Cold receptors and Heat receptors. Cold receptors are also called Frigidoreceptors which respond to low temperatures and are stimulated in a person walking in cold places. Heat receptors also called Chemoreceptors and stimulated in a person walking under the sun.
- Proprioceptors are receptors found in muscles that receive stimuli from those body parts which respond to movement.
- Exteroceptors are body surface receptors present on the surface of the body and respond to the outer environment.
- Sensory receptors are dendrites of sensory neurons specialized for receiving specific kinds of stimuli.
So the correct match between set I and set II is,” A- III, B- IV, C- I, D- II”.

Additional information:
Sensory receptors are mainly classified by three method
- Classification by receptor Complexity
- Classification by location
- Classification by types of stimulus detected.
Let's learn about some types of sensory receptors:
- Caloreceptors: Also called Ruffini's endings. It detects the warm temperature in the range of 25 to 45 degrees Celsius. The number of caloreceptors in our skins varies from 16000 to 30000.
- Frigido Receptors: Detect cold temperature in the range of 10 to 20 degrees Celsius. They are also known as end bulbs of Krause named after the scientist Wilhelm Krause. Here the number is much higher as compared to caloreceptor i.e. 150000 to 250000.
- Proprioceptors: consists of mechanosensory neurons found in muscles, tendons, and skin. These receptors allow us to know when and how far to stretch your legs and arms while walking and reaching. It also provides Rapid feedback about body and limb position.
- Exteroreceptors: They are found on the body surface which respond to stimuli from outside the body like sound, touch, smell, vision, temperature, pain, etc.

Note: Sensory receptors serve as a frontline because they are in contact with the stimulus. Taste or gustatory receptors, odor, or olfactory receptors have receptor molecules that undergo a process of binding to chemicals in the stimuli.