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The muscles that increase pressure in the abdominal cavity during urination, defecation, and childbirth are primarily the diaphragm, the abdominal muscles (rectus abdominis, transverse abdominis, and obliques), and the pelvic floor muscles. When these muscles contract, they elevate intra-abdominal pressure, assisting in expelling urine, feces, or aiding in the delivery of a baby. The coordinated action of these muscle groups is crucial for effective functioning during these processes.

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3mo ago

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