part of part_of has part has_part duct 导管(duct) exocrine system 外分泌系统 exocrine gland 外分泌腺 A gland that secretes products (excluding hormones and other chemical messengers) into ducts (duct glands) which lead directly into the external environment[WP]. Typical exocrine glands include sweat glands, salivary glands, mammary glands, stomach, liver, pancreas AEO:0000097 BTO:0000765 CALOHA:TS-2012 Currently this is logically defined by the system it belongs to, but a better system may be base this on presence/absence of ducts. However, the dual nature of the liver should be taken into consideration here. Consider adding subclasses EHDAA2:0003097 EMAPA:35327 FMA:9596 GAID:34 MA:0002564 MESH:D005088 UBERON:0002365 UMLS:C0015282 ducted gland ducted gland glandula exocrina glandula exocrina uberon 外分泌腺 外分泌腺 将产物（不包括激素和其他化学信使）分泌到直接导入外部环境的导管（腺管）中的腺体[WP]。典型的外分泌腺包括汗腺、唾液腺、乳腺、胃、肝脏、胰腺 目前这是由它所属的系统在逻辑上定义的，但是更好的系统可以基于存在/不存在管道。 但是这里应该考虑肝脏的双重性质。 考虑添加子类 管状腺体 管状腺体 gland 腺(gland)