What is a Reflex Arc?

What is a Reflex Arc?

• A. Nervous system is a network of neurons
• B. A pathway from sensory neurons to motor neurons in order to perform reflex actions
• C. A nerve cell that carries impulses
• D. A chemical released by glands

Answer: (B)

The main idea here is the reflex arc as a simple neural pathway that drives a reflex action. A reflex arc starts when a receptor detects a stimulus and a sensory neuron carries that impulse into the spinal cord. Inside the spinal cord, the signal is passed to a motor neuron (often via an interneuron), which sends the impulse to an effector muscle, causing a rapid, automatic response. This pathway explains why reflexes happen quickly and without conscious brain involvement. So, the reflex arc is best described as the pathway from sensory neurons to motor neurons that enables reflex actions. While neurons exist and chemicals mediate signaling, those options describe general components rather than the specific route that produces a reflex.

The main idea here is the reflex arc as a simple neural pathway that drives a reflex action. A reflex arc starts when a receptor detects a stimulus and a sensory neuron carries that impulse into the spinal cord. Inside the spinal cord, the signal is passed to a motor neuron (often via an interneuron), which sends the impulse to an effector muscle, causing a rapid, automatic response. This pathway explains why reflexes happen quickly and without conscious brain involvement.

So, the reflex arc is best described as the pathway from sensory neurons to motor neurons that enables reflex actions. While neurons exist and chemicals mediate signaling, those options describe general components rather than the specific route that produces a reflex.