1 Each muscle fibre ( muscle cell ) is covered by a plasma membrane sheath which is called the sarcolemma. 2  Tunnel-like extensions from the sarcolemma pass through the muscle fibre from one side of it to the other in transverse sections through the diameter of the fibre.keletal muscles consist of 100,000s of muscle cells (also known as muscle fibers) that perform the functions of the specific muscle of which they are a part.
Another leafy vegetable high in beta carotene in the form of vitamin A, kale has 478 milligrams of the nutrient and 20 calories per half cup serving. Kale recipes to try: â¢ Kale Chips. â¢ Roast Cod with Bacon, Potatoes, and Kale. â¢ Kale Salad with Glazed Onions and Cheddar.
Vitamin A-Rich Fruits. Fruits rich in vitamin A also help maintain healthy cartilage. Fruits contain beta-carotene, a pigment molecule your body breaks down into several forms of vitamin A, called retinoids.Retinoids play a role in cell growth and development, including the development of new cartilage cells.itamin A-Rich Fruits. Fruits rich in vitamin A also help maintain healthy cartilage. Fruits contain beta-carotene, a pigment molecule your body breaks down into several forms of vitamin A, called retinoids.