Final answer:
The given statement "A reflex arc does not always have to involve interneurons in the spinal cord" is false.
The correct answer is option b. false.
Step-by-step explanation:
A reflex arc is a pathway involving a sensory receptor, sensory neuron, interneuron, motor neuron, and effector. Although interneurons play a role in reflex arcs, they aren't always confined to the spinal cord. In certain cases, reflex arcs can skip the involvement of spinal interneurons, leading to a faster response. This streamlined process allows rapid reactions to stimuli without the need for interneurons to relay signals through the spinal cord. Understanding reflex arcs helps grasp how the body swiftly responds to stimuli, showcasing the adaptability and efficiency of neural pathways in orchestrating quick and automatic reactions to various stimuli.
Thus, the correct answer is option b. false.