n.上皮，上皮细胞

原形：epithelium复数：epithelia

The epithelial cells line the inner surfaces of organs and cavities in the body.
这些上皮细胞覆盖在身体器官和腔隙的内表面。
Epithelial tissues have a crucial role in protecting the body from external threats.
上皮组织对于保护身体免受外界威胁至关重要。
Squamous epithelium is a type of simple epithelium found on the skin and lining of the mouth.
鳞状上皮是皮肤和口腔衬里的简单上皮类型。
Ciliated epithelium, found in the respiratory tract, helps to move mucus and particles out of the lungs.
在呼吸道中发现的纤毛上皮有助于将黏液和微粒排出肺部。
The basement membrane separates the epithelial layer from the underlying connective tissue.
基底膜分隔上皮层和下面的结缔组织。
In the digestive system, the villi of the small intestine are covered with absorptive epithelium.
在消化系统中，小肠的绒毛被吸收性上皮覆盖。
The stratified epithelium in the skin allows for different functions, such as protection and sensation.
皮肤中的复层上皮允许不同的功能，如保护和感觉。
Epithelial cells undergo constant turnover, being replaced by new ones every few days.
上皮细胞不断更新，每隔几天就会被新的细胞取代。
Pathologists examine biopsy samples of epithelial tissue to detect early signs of cancer.
病理学家检查上皮组织活检样本以检测癌症的早期迹象。
The tight junctions between epithelial cells prevent the passage of substances between cells.
上皮细胞之间的紧密连接阻止了物质在细胞间的传递。