protonephridia 

  1. 名詞
protonephridium複數: 原腎管

    
                        
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例句

                

                    
    
                                                    
  1. 
                                A pair of protonephridia open into a bladder that drains into the cloaca.                            
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  2. 
                                Annelids with blood vessels use metanephridia to remove soluble waste products, while those without use protonephridia .                            
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                                The acanthocephalans lack an excretory system, although some species have been shown to possess flame cells ( protonephridia ).                            
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                                In nemertean protonephridia , flame cells which filter out the wastes are embedded in the front part of the two lateral fluid vessels.                            
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                                Nemertea use organs called protonephridia to excrete soluble waste products, especially nitrogenous by-products of cellular metabolism.                            
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