【名词&注释】
肺血流量(pulmonary blood flow)、每分输出量(minute volume)、尿道内括约肌、尿道外括约肌(external urethral sphincter)
[单选题]阴部神经兴奋时,可使()
A. 尿道内括约肌收缩 B. 尿道内括约肌松弛 C. 尿道外括约肌(external urethral sphincter)收缩 D. 尿道外括约肌(external urethral sphincter)松弛 E. 逼尿肌收缩