Answer:
The correct answer is: endomysium.
Step-by-step explanation:
There are three different layers of connective tissue that ensheath muscle.
The endomysium wraps each muscle fiber, the perimysium ensheaths a number of muscle fibers into fascicles, and the epimysium surrounds the whole muscle.
The endomysium is a thin layer of connective tissue, mostly composed of collagen, that has capillaries and nerves. It also provides the proper environment for the exchange of electrolytes like calcium, which is a key element in the process of muscle contraction.