The Reflex Arc in the Reflex Action

The reflex arc is the neural pathway that mediates a reflex action. It involves the transmission of sensory information from the receptors to the central nervous system (CNS) and the subsequent transmission of motor impulses from the CNS to the effectors. The correct formation of the reflex arc ensures the swift and automatic response to a stimulus without conscious thought.

Components of the Reflex Arc:

There are several components involved in the formation of the reflex arc. These include:

1. Receptor: The receptor is the specialized structure that detects the stimulus and converts it into an electrical signal. It can be located in various parts of the body, such as the skin, muscles, or organs.

2. Sensory Neuron: The sensory neuron carries the sensory information from the receptor to the central nervous system (CNS). It is responsible for transmitting the electrical signals generated by the receptor.

3. Spinal Cord: The spinal cord is a vital part of the CNS that acts as a relay center for sensory and motor information. In the reflex arc, the spinal cord plays a crucial role in processing the sensory information and generating an appropriate motor response.

4. Interneuron: The interneuron, also known as the association neuron, is located within the spinal cord. It connects the sensory neuron to the motor neuron and is responsible for integrating and coordinating the information received from the sensory neuron.

5. Motor Neuron: The motor neuron carries the motor impulses from the CNS to the effector, which is usually a muscle or gland. It stimulates the effector to produce the appropriate response to the stimulus.

6. Effector: The effector is the muscle or gland that carries out the response to the stimulus. In the case of a reflex action, the effector is typically a muscle that contracts in response to the motor impulses received from the motor neuron.

The Correct Sequence:

The correct sequence of the reflex arc in a reflex action is as follows:

Receptor -> Sensory Neuron -> Spinal Cord -> Interneuron -> Motor Neuron -> Effector

Therefore, the correct answer is option 'C' - Receptor-Spinal Cord-Muscles. This sequence ensures that the sensory information is transmitted to the CNS, processed in the spinal cord, and then relayed to the appropriate effector for an immediate response. This reflex arc bypasses the brain, allowing for a rapid and automatic reaction to potentially harmful stimuli.

In summary, the reflex arc in a reflex action is formed by the receptor, sensory neuron, spinal cord, interneuron, motor neuron, and effector. The reflex arc allows for quick and automatic responses to stimuli without involving conscious thought or the brain.