The responsible part of reflex action and communication between the brain and body is

Question

Accepted Answer

The correct option is (2):

The **Spinal Cord** is the correct answer because it serves two fundamental functions described in the question. Firstly, it acts as the principal center for most **reflex actions**. When an immediate, involuntary response is required (like pulling your hand away from heat), the sensory signal travels to the spinal cord, where interneurons quickly process the information and generate a motor command. This entire "reflex arc" is completed at the level of the spinal cord, bypassing the brain for speed. Secondly, the spinal cord is the main **communication superhighway** of the entire nervous system. It is a long, cylindrical bundle of nerve fibers that transmits all sensory information from the body to the brain and all motor commands from the brain back down to the muscles and glands, making it the essential link between the brain and the rest of the body.

The incorrect option is (1):
The **Skin** is a crucial sensory organ, acting as a receptor that detects external stimuli such as pain, pressure, and temperature. In the process of a reflex action, the skin is the component that first *senses* the stimulus, triggering the sensory nerve impulse that begins the reflex arc. However, the skin is not the part that processes this information to execute the reflex or the main trunk line for all communications. It provides the initial input, but it is not the core center of either the reflex or the general communication pathway.

The incorrect option is (3):
The **Eyes** are highly specialized sensory organs dedicated solely to vision. They convert light into electrical signals sent to the visual cortex of the brain. This is a very specific, dedicated pathway for only one type of sensory information (sight). The eyes do not function as the central mechanism for processing involuntary reflex actions across the whole body, nor do they handle the vast network of general sensory and motor communication between the brain and the torso or limbs.

The incorrect option is (4):
The **Ears** are the sensory organs responsible for hearing and, crucially, for maintaining balance and equilibrium through the vestibular system. Their function is focused on these specialized sensory inputs. They send signals related to sound and body position to dedicated areas of the brain. As with the eyes, they are specific sensory structures, not the general, all-encompassing communication pathway (like the spinal cord) that coordinates all motor movements and all reflex actions throughout the entire physical body.