High surface tension of liquid lining the alveoli tends to collapse them.Separates abdominal and thoracic contents.Peripheral afferents from intercostal and subcostal nerves.Efferent and central afferent: phrenic nerve (C3-5).Back attaches to T12 vertebral body, descents to L1/L2 on sides.Front arises from xiphoid process, costal margins.3 Openings: Aorta (T12), oesophagus (T10) and vena caval (T8).Muscle fibres arise from peripheral attachment to form central tendon →Ĭrest of diaphrgam (thin but strong aponeurosis).C- shaped structure of muscle and fibrous tissues.Dome shaped muscle that inserts into the lower ribs.Perfusion vs Diffusion Limited Gas Transfer.
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