Question

Which is the correct sequence of the components of a reflex arc?

• A. $\text{Receptors}\to \text{muscles}\to \text{sensory neuron}\to \text{motor neuron}\to \text{spinal cord}$
• B. $\text{Receptors}\to \text{motor neuron}\to \text{spinal cord}\to \text{sensory neuron}\to \text{muscles}$
• C. $\text{Receptors}\to \text{spinal cord}\to \text{sensory neuron}\to \text{motor neuron}\to \text{muscles}$
• D. $\text{Receptors}\to \text{sensory neuron}\to \text{spinal cord}\to \text{motor neuron}\to \text{muscles}$

Answer 1

The correct option is D

$\text{Receptors}\to \text{sensory neuron}\to \text{spinal cord}\to \text{motor neuron}\to \text{muscles}$

The path taken by nerve impulse in a reflex action is called a reflex arc. During a reflex action,

• The stimulus is detected by the receptor.
• This information is sent to the spinal cord through the sensory/afferent neuron.
• The spinal cord gives the response instead of taking it to the brain.
• This response reaches the effector through the motor/efferent neuron which stimulates the effector muscles or organs.
• Finally, the response is given by the effector organ.