Question

Organ of Ruffini is sensitive to ______.
a. Cold
b. Pressure
c. Touch
d. Heat

Answer 1

Hint: Cells in our body are specialized to receive stimulations. They have receptors that receive stimulus. These receptors are basically two types- somatic receptors, e.g. receptors of skeletal muscles and visceral receptors.

Complete answer:
Cold, pressure and touch receptors are types of extero receptors that receive stimuli directly from the external environment. Thermoreceptors are sensitive to touch, tango receptors are sensitive to touch and pressure and fridgo receptors are sensitive to cold. Examples of tango receptors are Merckel’s capsule, Merckel’s disk, Meissener’s corpuscle, etc.
Organ of Ruffini is one such receptor that is sensitive to heat, so it is a thermos receptor. It is sensitive to high temperature.

Hence, the correct answer is option (D).

Additional information:
Other thermoreceptors found in the body of animals are:
Krause end Bulb- These receptors are sensitive to temperature and pain. These are frigido in nature and are found on lips, tongue, conjunctiva of eye, corium of finger, etc.
Ampulla of Lorenzini- These are found in the snout region of fishes and they also act as Rheoreceptors. These are helpful in detecting the temperature of the water.

An example of an olfactory receptor is Jacobson’s organ. These are also known as Vomero-Nasal organs. These first appeared in amphibians and are well developed in snake, lizard, and Sphenodon but less developed in birds and mammals. These are present in the anterior part of their nasal cavity. These are lined by olfactory epithelium.

Proprio receptors are a type of extero receptors situated in a deeper part of the body in the subcutaneous region. They are sensitive to vibratory changes in the earth like earthquakes. These are found in insects and crustaceans.

Note: Intero receptors or visceral receptors are present in internal organs. They perceive stimulus from different parts of the body for hunger, thirst, pain, fatigueness, blood pressure, etc.