Which of the following statements about continence factors is true?

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Continence depends on the pelvic floor muscles to support the bladder and urethra and to help maintain urethral closure, especially when intra-abdominal pressure rises. The pelvic floor actively contracts to keep urine in and passively supports the urethra during activities like coughing, lifting, or sneezing. When these muscles are strong and coordinated, they improve closure pressure and reduce leakage, making pelvic floor musculature a factor in continence. In contrast, cardiac output, visual acuity, and hair color do not have direct roles in maintaining urinary continence.