人体内有很多分泌腺体，如甲状腺、胰腺、汗腺及性腺等，它们都具有分泌功能。内分泌的方式可分为外分泌与内分泌两种。腺体产生的分泌物通过管道输出，并直接输送到脏器的腔道或体表，其分泌物呈液体状的，称之为内分泌。如胰腺分泌的胰液通过胰管到小肠，汗腺分泌的汗液到体表。而内分...
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