Select all of the following that are components of a muscle fiber.Multiple select question.SarcolemmaMyelin sheathT tubuleAxon terminalSarcoplasm

Components of a Muscle Fiber

To determine which options are components of a muscle fiber, let's analyze each term provided:

1. Sarcolemma:

   • This is the cell membrane of a muscle fiber. It plays a crucial role in the excitation and contraction of muscle cells.
   • Component of a muscle fiber: Yes.

2. Myelin sheath:

   • This is a fatty layer that surrounds the axons of neurons, aiding in the conduction of electrical signals. It is not part of muscle fibers.
   • Component of a muscle fiber: No.

3. T tubule:

   • Also known as transverse tubules, these structures invaginate from the sarcolemma and play a vital role in transmitting action potentials deep into the muscle fiber, facilitating contraction.
   • Component of a muscle fiber: Yes.

4. Axon terminal:

   • This refers to the end part of a neuron where neurotransmitters are released to signal muscle fibers. It is part of the nervous system, not the muscle fiber itself.
   • Component of a muscle fiber: No.

5. Sarcoplasm:

   • This is the cytoplasm of a muscle fiber, containing various organelles and is essential for muscle metabolism and function.
   • Component of a muscle fiber: Yes.

Final Answer

The components of a muscle fiber are:

• Sarcolemma
• T tubule
• Sarcoplasm