The ________, a sheet of skeletal muscle that lies along the inferior boundary of the thoracic cavity, is active during normal or forceful inhalation.

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The diaphragm is a sheet of skeletal muscle that is located along the inferior boundary of the thoracic cavity. It contracts during normal or forceful inhalation, which allows the lungs to expand and air to be drawn in through the airways. The hilum is a structure found in some organs, such as the lungs, which serves as the entry point for blood vessels, nerves, and other structures. The mediastinum is the area between the two lungs in the thoracic cavity, and contains the heart, thymus gland, and other structures. The parenchyma refers to the functional cells of an organ, such as the lung tissue itself, rather than any supporting or structural cells.

The ________, a Sheet of Skeletal Muscle That Lies Along