The striated and polished surfaces are called slicken-sides.
有条痕的磨光为擦痕。
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The cells are striated. Each cell only has one nucleus. But the giveaway here is probably the cells' branching structure; where their offshoots meet with other nearby cells where they form those intercalated discs. It's cardiac muscle.
这些细胞是条纹状,每个细胞只有一个细胞核。但这里信息可能是细胞分支结构,它们分支与附近其他细胞相遇,形成了那些夹层盘。这是肌。
Like skeletal muscle fibers, cardiac muscle cells have striations. Like smooth muscle fibers, each cardiac muscle cell has only one nucleus and its contraction and relaxation are not under conscious control. Therefore, it is also called involuntary striated muscle.
像骨骼肌纤维一样,肌细胞也有条纹。像平滑肌纤维一样,每个肌细胞只有一个核而且其收缩和舒张不受意识控制。因此,它也被称为非随意横纹肌。