传递细胞是指与物质迅速地传递密切相关的薄壁细胞，也称转输细胞或转移细胞，它在20世纪60年代，借助于电子显微镜技术被发现。其细胞壁向胞腔内突入，形成许多指状或鹿角状的不规则突起，使质膜的表面积增加，并且富有胞间连丝，有利于物质的运送传递。这类细胞多分布在植物体内溶质大量集中、短距离运输频繁的部位，如叶脉末端输导组织的周围，成为叶肉和输导组织之间物质运输的桥梁。 传递细胞是最典型的形态特点是由非木质化的次生壁的一部分向内生长，突入细胞腔内，形成许多不规则的多褶突起。细胞膜紧贴这种多褶的胞壁向内生长物，形成了“壁-膜器”结构。这样，细胞膜的表面面积比普通薄壁细胞的平滑质膜的面积增大数倍至20 倍以上，有利于细胞对物质的吸收与传递。传递细胞的向内生长物在与木质部或韧皮部的输导分子相邻一侧的胞壁发育较好。在细胞壁上没有胞间连丝的部位，向内生长物大量形成。
传递细胞
双语例句原声例句
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细胞因子是一类小分子多肽，通过自分泌和旁分泌传递细胞应答。
Cytokines are polypeptides, and mediate cellular responses through autocrine and paracrine.
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结果表明：根瘤菌可诱发根瘤形成部位根段的根毛增生、形变和根外层传递细胞的发育。
The results showed that the hyperplasy of root hair, root deformation and the development of the root epidermal transfer cells were induced by rhizobia.
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成熟叶片小叶脉的韧皮细胞发现有大量的金颗粒标记，金颗粒主要标记在传递细胞的细胞壁中。
Many gold particles were distributed over the phloem cells of the fine veins of the mature leaves, and were mainly located in the cell wall of the transfer cells.
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They often involve the generation of what are called 'second messenger' molecules which carry the signal further into the cell.
过程中通常会生成一种叫做,第二信使的分子,将信号更深入地传递至细胞内部
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This is a signal - this passing of phosphorous - is a signal that's used very frequently in intracellular communication.
这是一种信号,一种通过磷酸来传递的信号,这种信号在细胞内通讯时经常被用到
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Now, in the heart action potential is moving from one heart muscle cell to another over the surface of the heart.
心脏中的动作电位,沿相邻心肌细胞在心脏表面传递
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