线粒体是细胞内的能量站。线粒体是双膜结构：外膜的透过性强；内膜上有内陷结构，称为脊，含新陈代谢呼吸链中所需的酶链。

Mitochondria with tubular cristae are not as common as those with the elongated cristae. The outer mitochondrial membrane, which is much more permeable as the inner membrane, is shown as blue patches.

这些内陷增大了细胞膜的表面积，从而提高了线粒体作为能量生成器官的工作效率。

动画展示的是一个简单的线粒体模型，线粒体内膜上有管状内陷。

来自虚拟现实世界的场景图片：

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