In the structure of a skeletal muscle fiber, what is the name of the plasma membrane of the muscle fiber?

• A. Endomysium
• B. Sarcoplasm
• C. Myofibril
• D. Sarcolemma

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the components of a skeletal muscle fiber. A skeletal muscle fiber is a single muscle cell that contains various structures including the plasma membrane, cytoplasm, and contractile elements.
2. Step 2: Identify the plasma membrane of the muscle fiber. In muscle cells, the plasma membrane is specialized and has a specific name different from typical cell membranes.
3. Step 3: Recall the terminology: the plasma membrane of a skeletal muscle fiber is called the 'sarcolemma'. This membrane surrounds the muscle fiber and plays a key role in conducting electrical signals.
4. Step 4: Differentiate the other options: 'Endomysium' is connective tissue surrounding individual muscle fibers, 'Sarcoplasm' is the cytoplasm inside the muscle fiber, and 'Myofibril' refers to the contractile elements inside the muscle fiber.
5. Step 5: Conclude that the correct term for the plasma membrane of a skeletal muscle fiber is 'sarcolemma'.