About 55% of whole blood is which is mostly made up of water. Select one: a. clotting proteins b. plasma c. white blood cells d. hemoglobin e. hemocrit Blood functions to maintain homeostasis in the human body by Select one: a. regulating the pH of body fluids. b. moving carbon dioxide away from cells following metabolism. c. transporting amino acids and other nutrients. d. preventing excessive blood loss through clotting. e. all the above.