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Hyman's Comparative Vertebrate Anatomy. Sterling Publishing Company, Inc. After transection of the brain stem just above the pons, the threshold is lowered and less bladder filling is required to trigger it, whereas after transection at the top of the midbrain, the threshold for the reflex is essentially normal. Voiding begins when a voluntary signal is sent from the brain to begin urination, and continues until the bladder is empty. Conservation International. The bladder's epithelium is termed transitional epithelium which contains a superficial layer of dome-like cells and multiple layers of stratified cuboidal cells underneath when evacuated. A male porcupine urinates on a female porcupine prior to mating, spraying the urine at high velocity.

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In general, women are less likely to urinate in public than men. Archived from the original on 29 July Hyman's Comparative Vertebrate Anatomy. Stallions sometimes exhibit the Flehmen response by smelling the urine of a mare in heat.

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