Muscle Fiber (Muscle Cell):Myofibrils: These are long, thread-like structures that run parallel within the muscle fiber. They contain the contractile proteins actin and myosin.
Sarcolemma: This is the cell membrane that surrounds each muscle fiber.
Sarcoplasm: The cytoplasm of a muscle fiber, containing the organelles, including the nuclei, mitochondria, and myofibrils.
Sarcoplasmic Reticulum: A specialized form of smooth endoplasmic reticulum that stores and releases calcium ions, which are essential for muscle contraction.
Sarcolemma: This is the cell membrane that surrounds each muscle fiber.
Sarcoplasm: The cytoplasm of a muscle fiber, containing the organelles, including the nuclei, mitochondria, and myofibrils.
Sarcoplasmic Reticulum: A specialized form of smooth endoplasmic reticulum that stores and releases calcium ions, which are essential for muscle contraction.
