Human respiratory system - thoracic cavity, Biology

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THORACIC CAVITY -

Thoracic cavity is air tight. On dorsal side vertebral column present.
On ventral side sternum present. On lateral side 12 pairs ribs present.
On posterior side diaphragm present which is fibro muscular, radial muscles present.
Diaphragm is helpfull in micturition, parturition and defaecation.
In pregnency diaphragm becomes inactive. So rate of respiration is increased.
In singers diaphragm is more active.Between ribs 11 pairs inter costal muscles are present. 8-12 are floating ribs.

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