Question

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

Explanation:

The example describes a reflex action where hand receptors detect heat (external stimulus), send signals to the nervous system, which then signals arm muscles to move the hand. This requires coordination between receptors, nervous system, and muscles—different body parts communicating to produce a response. Option A is wrong because cells coordinate, not work independently. Option C is wrong because the stimulus is external (hot surface) and communication is needed. Option B correctly states behavioral responses need coordination between body parts.

Answer:

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