Final answer:
A weakness in the walls of the muscle that allows underlying tissue to push through it is called a hernia.
Step-by-step explanation:
A weakness in the walls of the muscle that allows underlying tissue to push through it is called a hernia. Hernias can occur in different areas of the body, such as the abdomen, groin, or diaphragm, and can cause pain and discomfort. They often require medical intervention, such as surgery, to repair the weakened muscle wall.