It sends signals that control heart rate and respiration It receives messages and relays stimulus to contract muscle fibers It sends messages directly to muscles and glands It receives messages from the central nervous system Answer: - 1. It sends signals that control heart rate and respiration The sensory somatic nervous system controls muscular motor actions; this has nothing to do with breathing. The sensory somatic nerve system's main function is to send and receive letters from various networks and systems. The answer will n... More