Also known as GO:0030315, transverse tubule
T-tubules (transverse tubules) are extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells. With membranes that contain large concentrations of ion channels, transporters, and pumps, T-tubules permit rapid transmission of the action potential into the cell, and also play an important role in regulating cellular calcium concentration.
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横[小]管（亦称T[型]小管，英語：T-tubule）是肌膜（一种细胞膜）上很深的内陷凹槽，目前只在骨骼肌细胞和心肌细胞上发现。这些横小管能够让膜去极化并迅速吸入细胞内部。
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).