How do these systems work together in the human body to carry out lite processes? System 1 breaks food down into nutrients, and system 2 transports the nutrients to cells in the body. System 2 breaks food down into nutrients, and system 1 transports the nutrients to cells in the body. System 1 takes in oxygen from the atmosphere, and system 2 transports the oxygen to cells in the body. System 2 takes in oxygen from the atmosphere, and system 1 transports the oxygen to cells in the body