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A Breathing System

If you concentrate, you can control your breathing tanksmusclesairphotosynthesisSelect your answer. They’re controlled automatically when your musclesplantsbrainlungsSelect your answer senses carbon dioxide in your blood. If this builds up, you yawnphotosynthesisairtanksSelect your answer or take a deep breath. You breathe hard after running because your brainmuscleslungstanksSelect your answer can’t take in oxygen quickly enough. Mountain climbers need to carry oxygen lungsphotosynthesistanksplantsSelect your answer because the higher you climb the thinner the lungsbrainairplantsSelect your answer gets. We don’t run out of oxygen because plantstankslungsmusclesSelect your answer release it in a process called airbrainphotosynthesiscarbon dioxideSelect your answer. Plants also help by taking in and using plantscarbon dioxidephotosynthesisairSelect your answer from the air.