The pleurae are serous membranes, which mean they secrete a lubricating fluid, called serous fluid.
胸膜为
膜,这意味

可以分
润滑液
,
液。
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The synovium's composed of loose connective tissue, blood vessels, lymphatic vessels, and on the surface—" Type A" cells that clear cellular debris and " Type B" cells that produce components of synovial fluid, which helps lubricate the two articular surfaces.
滑膜由松散结缔组织、血管、淋巴管组成;在滑膜表面,A型细胞清理细胞碎屑,B型细胞产生滑
成分,滑
能够润滑两块关节的表面。