Margarita National High School Assessment: (Post-Test) ULTIPLE CHOICE: Encircle the letter of your answer. 1. Which two organ systems are working together? Messages travel down the spinal cord to the muscles causing movement of the body. nervous and muscular c. urinary and skeletal b. nervous and circulatory d. endocrine and circulatory 2. Which two systems are working together? The food nutrients are transported to the different parts of the body through the blood. a. nervous and circulatory c. digestive and circulatory b. digestive and urinary d. endocrine and circulatory Our brain interacts with the muscular system to coordinate movements throughout tho hody What oran system does the brain belong?