Which of the following is a factor in continence?

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Continence rests on the ability to keep urine within the bladder, which mainly comes down to the sphincter mechanism. The internal sphincter provides involuntary closure at the bladder neck, while the external sphincter offers voluntary control of the urethra, all supported by pelvic floor muscles. Neural signals coordinate when these muscles contract or relax, maintaining continence. If these sphincters or their neural control are weak or poorly coordinated, leakage can occur, so the sphincter mechanism is the key factor. The other options—heart rate, hair color, and visual acuity—do not influence the ability to hold urine.