Signals from and the body's are received by the brain and the spinal cord.

Signals from neurons and the body's nervous system are received by the brain and the spinal cord.

OR

Signals from organs and the body's senses are received by the brain and the spinal cord. (I looked it up on quizlet to make sure I was right, and someone had organs and senses for the blanks, so I put it here just in case)

I'm not sure which answers your teacher(s) accept, but hopefully this helps.

it's a.true. i'm kind of smart.