What is the function of the pericardial cavity in the thoracic region?

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The pericardial cavity’s job is to keep the heart enclosed and protected within a serous membrane by providing a lubricated space. It lies between the visceral and parietal layers of the serous pericardium and contains a small amount of serous fluid. This fluid lets the heart glide smoothly as it beats, reducing friction, while the surrounding serous membrane keeps the heart securely in the thoracic cavity. This is distinct from brain protection, bile storage, or blood filtration, which occur in other structures.