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OCR: SYSTEMS RELATED TO THE R ESPIR ATORY SYSTEM NERVOUS SYSTEM Part of the nervous system in your brain controls how quickly and deeply you breathe When your body's demand for oxygen increases. your nervous system steps up both the ate and depth of your breathing Click on this figure to find out more about the nervous system RESPIR ATORY SYSTEM Your respiratory system which enables you to brea the related to the circulatory nervous. and NERVOUS MUSCULOR CIRCULATORY muscular systems. SYSTEM SYSTEII SYSTEM stem uscular