All of the following are factors contributing to continence EXCEPT.

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Continence relies on a well-coordinated system that includes the rectal reservoir, the anal sphincters, and sensory feedback. The rectum’s capacity and compliance determine how much stool it can hold without a rise in pressure that would trigger leakage. Anorectal sensation provides awareness of rectal filling, allowing you to contract the external sphincter and pelvic floor to delay defecation until you choose to go. Stool consistency influences continence because looser stools can be harder to contain and firmer stools may be easier or harder to pass without leakage, depending on sphincter function. Blood type has no role in these mechanisms, so it does not contribute to continence.