Biology 12 - Nervous System Questions and Study Guide Biology 12 - Nervous System. - enables organisms to receive and respond to stimuli from their external and internal environments. Biology 12: The Nervous System Flashcards | Quizlet Biology 12: The Nervous System. STUDY. PLAY. Roles of the nervous system. coordination of movement, response to environment stimuli, intelligence, self-awareness, emotion. Two arbitrary (works together + connected) divisions of the nervous system.