The function of the fluid - filled pericadium is to
Answer Details
The pericardium is a fluid-filled sac that surrounds and protects the heart. Its main function is to reduce friction and cushion the heart as it contracts and relaxes during each heartbeat. Essentially, it acts as a shock absorber for the heart, preventing damage from the friction caused by the movement of the heart. Therefore, the correct option is: "reduce the friction caused by the pumping movements of the heart".