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.
Fruits and Vegetable Sources of Vitamin A. The most frequently consumed fruits and vegetables with vitamin A in the American diet include carrots, cantaloupe, sweet potatoes and spinach, according to the Office of Dietary Supplements.A 1/2 cup serving of boiled carrots contains 13,418 IU of vitamin A, meeting almost five times your daily needs. 1/2 cup serving of boiled spinach contains 11,458 IU of vitamin A, 1 cup of cantaloupe contains 5,411 IU and 1 cup of baked sweet potato with the skin contains 38,436 IU. A 1/2 cup serving of boiled kale and 1 cup of vegetable soup also meet more than 100 percent of your daily vitamin A needs.