The ________, a sheet of skeletal muscle that lies along the inferior border of the thoracic cavity, is active during breathing
A) diaphragm
B) hilum
C) mediastinum
D) parenchyma
A
Explanation: A) Correct!
B) The hilum is an indentation, not a skeletal muscle.
C) The mediastinum is a small area in the thoracic cavity.
D) The parenchyma is the functional part of the lung, not a sheet of skeletal muscle.
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