title: Respiratory muscles: a review of old and newer concepts.
mesh_terms: D003964:Diaphragm / Q000502:physiology*; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000503:physiopathology; D008176:Lung Volume Measurements; D009132:Muscles / Q000502:physiology; D012143:Respiratory Physiological Phenomena