Connective tissue that encloses a bundle of muscle fibers is called

Perimysium.

Explanation:

Perimysium: It is known as the sheath of connective tissues which helping in to group muscle fibers into bundles. They are helping delicate cells in protection, and support. It is also playing an important role in transmitting lateral contractile movements in skeletal muscles.

Each muscle compartments carries a bundle of muscle fibers, and this each bundle of muscle fibers is known as fasciculus. Muscle fibers is surrounded with the help of the connective tissues known as endomysium. Bundle of muscle fibers are surrounded with the help of connective tissues known as perimysium.

cell division is not regulated in tumor cells.