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cloaca    
n. 阴沟

阴沟

cloaca
n 1: (zoology) the cavity (in birds, reptiles, amphibians, most
fish, and monotremes but not mammals) at the end of the
digestive tract into which the intestinal, genital, and
urinary tracts open
2: a waste pipe that carries away sewage or surface water [synonym:
{sewer}, {sewerage}, {cloaca}]


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  • Cloaca - Wikipedia
    In the embryo, the embryonic cloaca divides into a posterior region that becomes part of the anus, and an anterior region that develops depending on sex: in males, it forms the penile urethra, while in females, it develops into the vestibule or urogenital sinus that receives the urethra and vagina [13][19] However, some placental mammals
  • Cloaca: The Single Opening in Animals, Plus Human Implications
    A cloaca is a single bodily opening in many animals for excretion and reproduction In rare human cases, failure to separate during development leads to complications
  • Cloaca | Mammals, Birds, Reptiles | Britannica
    Cloaca, (Latin: “sewer”), in vertebrates, common chamber and outlet into which the intestinal, urinary, and genital tracts open It is present in amphibians, reptiles, birds, elasmobranch fishes (such as sharks), and monotremes
  • What Is a Cloaca? One Opening for Everything - ScienceInsights
    A cloaca is a single body opening that handles three jobs at once: digestion waste, urinary waste, and reproduction Instead of having separate exits for each system, animals with a cloaca funnel everything through one shared chamber
  • What is a Cloaca and Which Animals Have One? - Biology Insights
    The cloaca is a common anatomical feature found across many vertebrate groups, indicating its ancient evolutionary origin All amphibians, such as frogs and salamanders, possess a cloaca
  • CLOACA Definition Meaning - Merriam-Webster
    John Timmer, ArsTechnica, 17 Sep 2025 Everything comes out of one all-purpose hole called the cloaca in a chunky white paste that’s both poop and pee combined
  • Why some animals have just one hole for everything – from pooping to . . .
    What is a cloaca? A cloaca is a single opening in the bodies of birds, reptiles, amphibians, elasmobranch fish (including sharks) and monotremes (platypuses and echidnas), which serves as a combined digestive, urinary and reproductive tract
  • Cloaca（Biological organ）_Baiduwiki - 百度百科
    The cloaca is the dilated terminal portion of the gut in Vertebrate, serving as the common exit passage for feces, urine, and gametes It is common in cartilaginous fishes, amphibians, reptiles, birds, and monotremes In cyclostomes, bony fishes, and placental mammals, a separate anus has evolved; their excretory and reproductive ducts converge into a urogenital sinus before exiting via the
  • Cloaca Development - Embryology
    cloaca - (cloacal cavity) The term describing the common cavity into which the intestinal, genital, and urinary tracts open in vertebrates Located at the caudal end of the embryo it is located on the surface by the cloacal membrane
  • Biology:Cloaca - HandWiki
    A cloaca ( (listen) kloh-AY-kə), pl : cloacae ( kloh-AY-see or kloh-AY-kee), or vent, is the rear orifice that serves as the only opening for the digestive (rectum), reproductive, and urinary tracts (if present) of many vertebrate animals





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