Question

fill in the blank question
a weak, bulging sac in the wall of an artery that pulsates with each beat of the heart and which may eventually rupture is called a(n)
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Explanation:

In the field of Medicine and Health (a subfield of Natural Science), an aneurysm is defined as a weak, bulging sac in an artery wall that pulsates with heartbeats and can rupture. This matches the description in the question.

Answer:

aneurysm