which three organ systems are working together in the following scenario: u are exposed to a friend who has the common cold. When your body detects this foreign entity, it uses the a hormone to signal the oduction white blood cells to fight off the infection. The white blood cells are carried throughout your body, and the invader is guished! Huzzah! Which three systems were working together to fight the cold? (choose 3) (a) Muscular (b)Circulatory (c) Respiratory (d)Immune (e)Endocrine (f)Nervous