Final answer:
Skeletal myofibers are the individual cells that make up skeletal muscles, and they are organized into myofibrils containing thick and thin filaments. Capillaries are blood vessels that supply oxygen and nutrients to the muscle fibers and remove waste products. The close proximity between skeletal myofibers and capillaries allows for efficient exchange of substances between blood and muscles.
Step-by-step explanation:
Skeletal myofibers, also known as muscle fibers, are the individual cells that make up skeletal muscles. These muscle fibers are long and multinucleated, with a membrane called the sarcolemma and a cytoplasm called the sarcoplasm. The muscle fibers are composed of myofibrils, which contain thick and thin filaments made of proteins like myosin and actin. These filaments are organized into repeating units called sarcomeres, which are the functional units of skeletal muscles. Capillaries, on the other hand, are tiny blood vessels that penetrate skeletal muscles and supply them with oxygen, nutrients, and remove waste products. Capillaries are in close proximity to the skeletal myofibers, allowing for efficient exchange of substances between the blood and the muscle fibers.