Question

What may happen if there is no pericardical membranes around the heart

Answer 1

Answer:

When this happens, the heart can't stretch properly as it beats. This can prevent the heart from filling up with as much blood as it needs. The lack of blood can cause increased pressure in the heart, a condition called constrictive pericarditis. Cutting this sac away allows the heart to fill normally again.

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Answer 2

Explanation:

If there is an absence of pericardial membranes around heart then it will develop friction with the surrounding tissues(as a result of ABSENCE of lubrication) and thus making it difficult for the heart to beat.

Besides this Heart won't be fixed in one place inside the chest cavity if Pericardial membrane would not be present.