Question

The path of passage of stimulus when you accidentally touch a hot plate is

• A. receptor $\to$ brain $\to$ muscles
• B. muscles $\to$ spinal cord $\to$ receptor
• C. muscles $\to$ brain $\to$ receptor
• D. receptor $\to$ spinal cord $\to$ muscles

Answer 1

Answer: (D)

The nerve pathway followed by a reflex action is called a reflex arc, e.g. a simple reflex arc happens if we accidentally touch something hot. Receptor in the skin detects a stimulus (the changes in temperature) and sends it to spinal cord. Effector produces a response (muscles contract to move hand away). Thus, the path is receptor $\to$ spinal cord $\to$ muscles.