Using a customer supplied envelope, an individual can mail a Priority Mail Express letter envelope weighing one ounce up to sixteen ounces for $31.20 plus the extra fee of $12.50 to add Sunday/Holiday Delivery.
muscle cell-an elongated contractile cell that forms the muscles of the body. muscle fiber, muscle fibre. fibre, fiber-any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber).
These cells are called muscle cells (also called myocytes or muscle fiber). The muscle cell is also called the muscle fiber because it is long and tubular. The muscle cell develops from myoblasts through myogenesis. 1. The muscle cell is comprised of myofibrils, each consisting of repeated sections of sarcomeres.