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).
What are muscles? Muscle cells (muscle fibers) are different from other cells because they can contract when stimulated (usually by a neuron). Put muscle fibers together in an orderly array and they form a muscle capable of developing strong forces.