Correct Response: D. The nervous and endocrine systems each provide a means of communication within the body. The nervous system employs the brain, spinal cord, and neurons to send and receive messages in order to process stimuli and provide appropriate voluntary and involuntary responses. The endocrine system uses hormones produced in various cells and glands to send chemical messages that help regulate body functions such as growth and metabolism. Regulation of growth and development (A), control of blood pressure and water balance (B), and activation of reproductive glands (C) are primarily functions of the endocrine and excretory systems, rather than the nervous system.
