Each one of your different skeletal muscles — like your biceps brachii, or vastus lateralis or gluteus maximus — is technically its own organ, made up mostly of muscle tissue, but also of connective tissue, blood vessels, and nerve fibers.

你每一块不同——比如肱二头、股外侧或臀大——严格来说都是自己器官，主要由组织组成，但也由结缔组织、血管和神经纤维组成。

An example would be the descending portion of a biceps curl, causing the biceps brachii muscle to lengthen.

例如，二头下降部分，让其臂伸长。

Those muscle fibers then form larger, string-like bundles called fascicles, which combine to form the larger rope-like muscle organ, like your biceps brachii.

这些纤维然后形成更大、像绳子一样束，叫做束，它们结合在一起形成更大像绳子一样器官，就像你肱二头。