Skeletal muscle tissue forms the muscles that move our bones and joints. [3] Forceful myocardial contraction, in turn mainly caused by ventricular fibrillation [4] or electrical injury. Intercalated discs are complex structures that connect adjacent cardiac muscle cells. The muscular system is closely associated with the skeletal system in facilitating movement. Module 2: Tissues II - Muscle and Nervous - Anatomy 337 - Unizin myofilaments arranged into larger striations. Regulate the inflammatory response to damage. Square-shaped nuclei, indicating forceful myocardial contraction. In its classic definition, the intercalated disc is composed of three electron-dense structures: adherens junctions, desmosomes , and gap junctions ( Figure 22-1 ). The fibers are separated by collagenous tissue that supports the capillary network of cardiac tissue. The microglia then phagocytize debris from the dead or dying cells and invading microorganisms. What would be the drawback of cardiac contractions being the same duration as skeletal muscle contractions? Intercalated discs support synchronized contraction of cardiac tissue. Visceral motor activity is part of the autonomic nervous system, which will be covered in Unit 2. In fact, cell organelles are also concentrated in this cytoplasmic region around the nucleus. Intercalated disc - Wikipedia The fibers are crossed by linear bands called intercalated discs. What is the function of intercalated discs? The above classifications describe three forms of muscle tissue that perform a wide range of diverse functions. Pacemaker cells stimulate the spontaneous contraction of cardiac muscle as a functional unit, called a syncytium. Contribute to the blood-brain barrier, a physiological barrier that keeps many substances that circulate in the rest of the body from getting into the central nervous system, restricting what can cross from circulating blood into the CNS. Voltage gated channels open and calcium ions are released in the sarcoplasm. The nervous system can be divided into two major regions: the central and peripheral nervous systems. The contraction mechanism is similar to that of skeletal muscle. fasciae adheretes (2) are identified. The remainder of the intercalated disc is composed of desmosomes. It has a lot of " gap " junctions, so the heart functions as a whole ( the gap junctions help spread the depolarization in the cardiac muscle, as the citoplasm of the cardiac cells are in contact.
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