Which of the following lists the five basic components of a reflex arc in the correct order?

• A. Sensory neuron, receptor, integration center, effector, motor neuron
• B. Effector, motor neuron, integration center, sensory neuron, receptor
• C. Integration center, receptor, sensory neuron, effector, motor neuron
• D. Receptor, sensory neuron, integration center, motor neuron, effector

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the concept of a reflex arc. A reflex arc is the neural pathway that controls a reflex action. It involves a sequence of components that work together to produce a rapid, involuntary response to a stimulus.
2. Step 2: Identify the five basic components of a reflex arc. These include: (1) receptor, (2) sensory neuron, (3) integration center, (4) motor neuron, and (5) effector.
3. Step 3: Define each component: (1) The receptor detects the stimulus (e.g., pain, temperature). (2) The sensory neuron transmits the signal from the receptor to the integration center. (3) The integration center (usually in the spinal cord) processes the information and determines the response. (4) The motor neuron carries the response signal from the integration center to the effector. (5) The effector (e.g., muscle or gland) performs the action.
4. Step 4: Arrange the components in the correct order based on their function in the reflex arc: receptor → sensory neuron → integration center → motor neuron → effector.
5. Step 5: Compare the given options to the correct order. The correct answer is: 'Receptor, sensory neuron, integration center, motor neuron, effector.'