Reflex actions are given by neuronal pathways called reflex arcs , which comprise different components. What should be the correct sequence of its components in withdrawal reflex after touching the hot things suddenly to withdraw the finger ?

Options

A. Afferent neuron `rarr` Efferent neuron `rarr` Interneuron `rarr` Receptor `rarr` Effector
B. Effector `rarr` Afferent neuron `rarr` Efferent neuron `rarr` Interneuron `rarr` Receptor
C. Receptor `rarr` Afferent neuron `rarr` Efferent neuron `rarr` Effector
D. Receptor `rarr` Afferent neuron `rarr` Interneuron `rarr` Efferent neuron `rarr` Effector

Answer

To solve the question regarding the correct sequence of components in a withdrawal reflex after touching something hot, we need to understand the structure of a reflex arc. Here’s a step-by-step breakdown:

### Step-by-Step Solution:

1. **Receptor**: The first component in the reflex arc is the receptor. When you touch something hot, the sensory receptors in your skin detect the heat or pain.

**Hint**: Think of the receptor as the sensor that detects changes in the environment.

2. **Afferent Neuron (Sensory Neuron)**: Once the receptors detect the stimulus (heat), they send an electrical signal through the afferent neurons (also known as sensory neurons) towards the central nervous system (CNS).

**Hint**: This neuron carries the signal from the receptor to the CNS.

3. **Interneuron (Relay Neuron)**: Within the CNS, the signal is processed, and an interneuron (or relay neuron) connects the sensory neuron to the motor neuron. This interneuron acts as a bridge for the signal.

**Hint**: The interneuron is crucial for processing the information and relaying it.

4. **Efferent Neuron (Motor Neuron)**: After processing, the signal is sent out through the efferent neuron (motor neuron) from the CNS to the effector.

**Hint**: This neuron carries the response signal away from the CNS to the muscles.

5. **Effector**: The final component is the effector, which is usually a muscle that responds to the signal by contracting and withdrawing the finger away from the hot object.

**Hint**: The effector is what executes the response to the stimulus.

### Correct Sequence:
The correct sequence of components in the withdrawal reflex is:
1. Receptor
2. Afferent Neuron (Sensory Neuron)
3. Interneuron (Relay Neuron)
4. Efferent Neuron (Motor Neuron)
5. Effector

### Conclusion:
Thus, the correct answer is option 4: Receptor, Afferent Neuron, Interneuron, Efferent Neuron, and Effector.