n.括约肌

原形：sphincter复数：sphincters

The sphincter muscle in the anus tightens to control bowel movements.
阴道括约肌在控制排便时会收缩。
The esophageal sphincter prevents food from flowing back up into the throat.
胃食管括约肌防止食物逆流回喉咙。
He underwent surgery to repair his damaged anal sphincter.
他接受了手术来修复受损的肛门括约肌。
The cardiac sphincter is a crucial component of the digestive system.
心脏括约肌是消化系统的关键部分。
She experienced difficulty with her pelvic floor muscles, including her sphincters.
她在骨盆底肌肉，包括括约肌方面有困难。
The sphincter pectus is a muscle that helps with breathing and chest movement.
膈肌有助于呼吸和胸部运动。
The doctor examined the patient's anal sphincter under a microscope.
医生在显微镜下检查了病人的肛门括约肌。
Stress can sometimes cause involuntary loss of bladder or anal sphincter control.
压力有时会导致膀胱或肛门括约肌失控。
The sphincter ani externus is the outermost layer of the anal sphincter.
外括约肌是肛门括约肌最外层的部分。
The sphincter muscle in her neck tightened involuntarily when she was startled.
当她受惊时，她的颈部括约肌不由自主地紧绷。
这些例句主要描述了身体中不同部位（如肛门、胃、心脏、呼吸系统等）的括约肌，它们在人体内起到控制物质流动、保持器官功能正常的重要作用。括约肌可能因疾病、压力或其他因素而出现问题，需要医学干预。