Question

the brain always lets the body know when it has been injured. signals in the nervous system help the brain communicate with the rest of the body. the brain controls how loudly people shout when they are hurt. signals in the nervous system work better when humans listen carefully to them.

Explanation:

The nervous system uses electrical and chemical signals to transmit information between the brain and other parts of the body. This is a fundamental concept in understanding how the body functions. Option B correctly states that signals in the nervous system help the brain communicate with the rest of the body. Option A is incorrect as the brain doesn't always immediately know about injury (e.g., some nerve - damage might not be immediately detected). Option C is not a primary function of the brain in relation to the nervous system's basic communication role. Option D is not a valid scientific statement about how nervous - system signals work.

Answer:

B. Signals in the nervous system help the brain communicate with the rest of the body.