Which part of the body is responsible for initiating a reflex action?
The brain
The spinal cord
The heart
The lungs
The spinal cord is responsible for initiating a reflex action. When a stimulus is detected by a sensory neuron, the information travels to the spinal cord, where an interneuron relays the signal to a motor neuron. The motor neuron then sends a signal to the muscle, causing a rapid, involuntary response. This process occurs without conscious thought or decision-making and allows for quick reactions to potentially harmful stimuli. While the brain can modulate reflex actions, the initial initiation of the reflex arc occurs in the spinal cord.
Option 2 is the correct answer.