Summary of 1. ANATOMÍA MICROSCÓPICA MUSCULAR (FISIOLOGÍA MUSCULAR)

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The main component of a muscle is the myofibril, which is made up of two types of filamentous proteins: the fine, 8-nanometer-long type, and the thicker, 16-nanometer-long type. The filaments overlap one another in varying amounts, depending on whether the muscle is contracted or relaxed. This overlapping of filaments produces the muscle's transverse striations, which can be seen both in individual myofibrils and in the entire muscle fiber. Proteins of support, such as myosin and titin, keep the filaments in the center of the striated zone tight. These two proteins, myosin and titin, are the main contractile proteins in the muscle. In relaxed muscles, myosin covers the sites of previous myosin-titin cross-links, preventing them from being cross-linked again.

• 00:00:00 Every muscle is composed of cells that are long and thin, and are called fibers. The term "fiber muscular" is equivalent to the term "cellular muscular." The muscle is also accompanied by capillaries and nerves, and has a connective tissue layer around each fiber. Three thick,connective tissue layers protect and reinforce the muscle. These layers are the epimysium, perimysium, and endomysium. The sarcoma is the plasma membrane that surrounds the muscle cells. The lemma (shark), made up of thousands of tiny imaginary images of the muscle, lies superficially on the muscle. The transverse tubules (transverse tubules), which are open to the cellular environment, are found in the muscle fluid. These tubules are composed of liquid interstitial cells. Each cell has many nuclei near the sharq (shark) or muscle origin. The mitochondria are found in close proximity to the muscle cells in a strategic location for the synthesis of ATP. In relaxed muscles, the reticular shark plasma (plasma rich in glucogen and a protein called myoglobin) accumulates.
• 00:05:00 In this YouTube video, the anatomy of a muscle is explained. The muscle's main component are the myofibrils, which are made up of two types of filaments: the fine, 8-nanometer-long filamentous proteins and the thicker, 16-nanometer-long filamentous proteins. The filamentous proteins overlap one another in varying amounts, depending on whether the muscle is contracted or relaxed. This overlapping of filaments produces the muscle's transverse striations, which can be seen both in individual myofibrils and in the entire muscle fiber. Proteins of support, such as myosin and titin, keep the filaments in the center of the striated zone tight. These two proteins, myosin and titin, are the main contractile proteins in the muscle. In relaxed muscles, myosin covers the sites of previous myosin-titin cross-links, preventing them from being cross-linked again. Finally, in a future video, we will learn which mechanisms lead to muscle contraction.