The Blader contracting and the Prostate relaxing to allow urine to flow
In males, the urethra expels both urine and sperm. In females, the urethra expels only urine.
urinary bladder
The urethra is a structure inside the body that expels urine from the bladder. Its function is to conduct the urine from the bladder for elimination.
An elephant expels about 50 litres of urine a day
The urethral opening in males excretes urine and sperm.
In males, the urethra carries semen as well as urine.
urethra
The Urethra is the part of the body on males/females where urine is passed.
Smooth muscle surrounding the bladder pushes urine out of the urethra.
Males of course because they have more muscle.
The bladder.
Expels some sort of bodily fluid or substance or gas, such as urine, excrement, or methane. Occasionally, if lucky, semen.