Question

The organs of Ruffini are receptors of:
A. Cold
B. Pressure
C. Heat
D. Touch

Answer 1

Hint: The receptors are the proteins that are involved in the process of transducing and receiving signals in a biological system. The chemical messengers cause the initiation of receptors and receptors produce the response.

Complete answer:
In a multicellular organism, cells require to send signals to the other cells that are away from them but have their function coordinated with them. These cells communicate with each other via messengers that are basically chemicals. These chemical messengers are specific to each cell type and to the type of information they convey. Thus, to receive these signals and respond to them, cells have various types of receptors that read the message and cause the reaction in the cells. A point to be noted is that not all the cells respond to the same signals, every signal has a specific effect on different types of cells and different types of signals are used by cells for different purposes.
There are various types of receptors that are specific to the signal, some of which are:
Krause end bulbs: These are the receptors that have nerve terminals in the skin, mucosa of oral cavity and other parts consisting of laminated capsule of connective tissue enclosing the terminal and branching end of the afferent nerve fiber which is generally sensitive to cold environment or stimulus.
Pacinian corpuscles: These are one out of four major types of mechano-receptor cells present in mammalian skin. They have their nerve endings in the skin and are responsible for the sensitivity to the vibrations and pressure. They readily respond to sudden disturbances.
Ruffini endings: These are the small, spindle shaped receptors that are found throughout the dermis layer, subcutaneous tissues and few connective tissues. They act as thermoreceptors that are sensitive to heat, which respond for a long time.
Meissener’s corpuscles: These are a type of mechanoreceptor that has a nerve ending in the skin which causes sensitivity to touch when experienced in the range of 10-50 hertz. These are most concentrated in the regions of thick hairless skin like finger pads.

Therefore, the correct answer for this question is option C- heat.

Note: One out of many characteristics of a living being is its ability to respond to the stimulus by the environment. The human sensory system has evolved efficiently and can process numerous messages that trigger the cells receptors simultaneously. This complex feature of our body helps us to be aware of our surrounding and act accordingly.