Interstitial fluid moves into the lymphatic capillaries by this method; Group of answer choices By gravity, using valves to stop back flow As a result of blood pressure forcing the lymph along through one-way valves Through flaps that act like one way valves in the walls of the lymphatic capillaries Through simple diffusion, using valves to stop back flow Contractions of the middle smooth muscle layer in the vessel wall using valves to stop back flow