The plasma membrane of a muscle fibre is the:

1. Each muscle cell is bounded by a membrane. 2. It encloses the sarcoplasm. 3. A skeletal muscle fiber is surrounded by a plasma membrane called the sarcolemma. 4. So the answer is the sarcolemma. _Source: OpenStax 'Anatomy and Physiology 2e', Ch 10 'Muscle Tissue'_