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MDCAT Biology QUESTION #11272
Question 1
The reflex arc involves which of the following sequences?
  • Receptor $\to$ Sensory neuron $\to$ Spinal cord $\to$ Motor neuron $\to$ Effector✔️
  • Receptor $\to$ Motor neuron $\to$ Spinal cord $\to$ Sensory neuron $\to$ Effector
  • Effector $\to$ Sensory neuron $\to$ Brain $\to$ Motor neuron $\to$ Receptor
  • Sensory neuron $\to$ Receptor $\to$ Motor neuron $\to$ Effector $\to$ Spinal cord
Correct Answer Explanation
A reflex arc follows the sequence: stimulus detected by receptor $\to$ signal travels via sensory (afferent) neuron to the spinal cord (integration center) $\to$ signal travels via motor (efferent) neuron $\to$ effector (muscle or gland) responds.