The large muscular sheet which forms the floor of the chest cavity is known as

Diaphragm

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Lungs

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Ribcage

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None of the above

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Solution

The correct option is C Diaphragm
The diaphragm is a large muscular sheet which forms the floor of the chest cavity. It is a domed shaped structure made up of muscles which separate thoracic cavity and abdominal cavity.
So the correct answer is 'Diaphragm'.

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