Gynaecology & Obstetrics General 1e865ed7 Coaptation is A Urethral mucosal approximation. B Adaptation of bladder to large volumes of filtrate. C Stretch of urethra while voiding. D Constriction of ureters in response to low volumes of urine. High-Yield Explanation Submucosal vascular network aids in Urethral mucosal approximation called as coaptation, which improves continence.