Question

when a hot surface is touched, receptors in the hand send a signal to the nervous system. the nervous system then sends a signal to the muscles in the arm to contract and move the hand from the hot surface. which of these best describes this example? a. a behavioral response requires coordination and communication between different parts of the body. b. cells in the body work independently of each other and have no need to coordinate or communicate. c. a behavioral response triggered by an internal stimulus does not require communication between cells.

Explanation:

The example describes a reflex response: hand receptors (stimulus detection) send signals to the nervous system, which then signals arm muscles to contract. This requires coordination between receptors, nervous system, and muscles—different body parts communicating to produce a behavioral response. Option B is incorrect because cells coordinate, not work independently. Option C is incorrect as the stimulus (hot surface) is external, not internal, and communication is required.

Answer:

A. A behavioral response requires coordination and communication between different parts of the body.