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| Description: Micturition The discharge of urine involves voluntary and involuntary muscle contractions. Stretch receptors trigger a spinal reflex, which we learn to control in childhood. The urethra carries urine from the internal urethral orifice to the exterior of the body. In males, it discharges semen as well as urine. Picture Stats: Views: 201 Filesize: 902.76kB Height: 779 Width: 1394 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40847 |