The normal shape of the diaphragm is

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(B) The diaphragm is a primary muscle of respiration that separates the thoracic cavity from the abdominal cavity. In its relaxed state,the diaphragm

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Dome-like

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(B) The diaphragm is a primary muscle of respiration that separates the thoracic cavity from the abdominal cavity. In its relaxed state,the diaphragm is dome-shaped,with the convex side facing the thoracic cavity. During inhalation,it contracts and flattens,which increases the volume of the thoracic cavity and facilitates air intake.

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