Both the cells of the tunica intima and tunica media generally get the nutrients they need from the blood in the lumen.

内膜和中膜的细胞，都能从管腔内的血液中获取所需的营养物质。

Surrounding the tunica intima is the middle layer, the tunica media, made of smooth muscle cells and sheets of the protein elastin.

围绕内膜的是中间层，中膜，由细胞和蛋白质弹性蛋白片组成。

A dissection is where the inner wall, or intima, gets a tear, and blood tracks into a false lumen in the vessel wall.

动脉内壁或者说内膜产生撕裂，血进入管壁的假腔中。

The innermost tunic is called the tunica intima, which includes the endothelial cells, which create a slick surface that minimizes friction for blood moving through it.

最内层者称为内膜，有内皮细胞构成；它们形成了光表面，使血液经时的摩擦降到最低。

Anatomists call these layers " tunics, " and the innermost section is the tunica intima — which should be pretty easy to remember because, you know, it has like intimate contact with the lumen. It's like your circulatory underpants.

解剖学家称这些层为束腰外衣，最里面的部分是内膜——这应该很容易记住，因为，你知道，它和内腔有亲密的接触。就像你的循环内裤。

Capillary walls are made of just a single layer of epithelial tissue, which form only the tunic intima, so they're able to deliver the oxygen and other nutrients in your blood to their cellular destinations through diffusion.

毛细血管壁仅由单层上皮组织组成，仅形成被膜内膜，因此它们能够通过扩散将血液中的氧气和其他营养物质输送到细胞目的地。