Lungs lie in the thoracic cavity separated by ............ from the abdominal cavity.

Septum

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Diaphragm

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Thoracic cage

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Ribs

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Solution

The correct option is B Diaphragm
The diaphragm separates the thoracic cavity, containing the heart and lungs, from the abdominal cavity and performs an important function in respiration. As, the diaphragm contracts, the volume of the thoracic cavity increases and air is drawn into the lungs. It is a dome-shaped sheet of muscle that is inserted into the lower ribs.

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Lungs lie in the thoracic cavity separated by __ from the abdominal cavity.

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