A. urethr, urethra (tube that carries urine from the bladder to the outside world) meat opening
B. urethr, urethra (tubes that carry urine from the kidneys to the bladder) meat opening
C. urethr, urethra (tube that carries urine from the bladder to the outside world) meat flow
D. urethr, urethra (tubes that carry urine from the kidneys to the bladder) meat flow
E. al, pertaining to us structure