What is the primary function of the pericardial sac
A)to prevent excessive expansion of the heart as it fills with blood
B)to secrete a fluid that reduces friction while the heart beats
C)to serve as a reservoir for blood to be used during strenuous exercise
D)to provide oxygen and nutrients to the heart muscle

Question

Quizplus · Accepted Answer

The primary function of the pericardial sac is to secrete a fluid that reduces friction as the heart beats. This fluid, called pericardial fluid, creates a cushioning effect that allows the heart to contract and expand without rubbing against other structures in the chest cavity, which could cause damage or interfere with the heart's function. The pericardial sac also helps to protect the heart from infection and inflammation.

What Is the Primary Function of the Pericardial Sac