what is the function of the urethral opening
Urethra Females use their urethra only for urinating, but males use their urethra for both urination and ejaculation.[1] The external urethral sphincter is a striated muscle that allows voluntary control over urination.[2] Only in the male is there an additional internal urethral sphincter muscle.[3]
Marcus Álvarez
My Ántonia
Vein Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.