Which of the following structures is found within a skeletal muscle?

• A. Myofibril
• B. Neuron
• C. Alveolus
• D. Nephron

Answer: (A)

Verified step by step guidance

1. Step 1: Begin by identifying the primary function and location of each structure listed in the options. For example, a myofibril is a specialized structure found within skeletal muscle cells, while neurons are part of the nervous system, alveoli are found in the lungs, and nephrons are located in the kidneys.
2. Step 2: Understand the anatomy of skeletal muscle. Skeletal muscle is composed of muscle fibers (cells), which contain myofibrils. Myofibrils are the contractile units responsible for muscle contraction and are made up of repeating sarcomeres.
3. Step 3: Compare the listed structures to the components of skeletal muscle. Myofibrils are directly involved in the function of skeletal muscle, whereas neurons, alveoli, and nephrons are not part of its structure.
4. Step 4: Recall the role of myofibrils in muscle contraction. Myofibrils contain actin and myosin filaments that slide past each other during contraction, a process regulated by calcium ions and ATP.
5. Step 5: Conclude that myofibrils are the correct answer because they are integral to the structure and function of skeletal muscle, unlike the other options which are unrelated to muscle anatomy.