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Muscle is one of the four primary tissue types of the body. Most skeletal muscles contain a mixture of all three types. The fibers are separated by collagenous tissue that supports the capillary network of cardiac tissue. Muscles used for power movements have a higher ratio of fast glycolytic fibers to slow oxidative fibers. As part of a normal physiological response, the affected area is repaired and replaced with fibrous tissue that interrupts the propagation of the excitatory stimuli and subsequent contraction of the heart. Intercalated discs support synchronized contraction of cardiac tissue. Identify the different types of neurons and glial cells and their functions. The pacemaker cells can also respond to various hormones that modulate heart rate to control blood pressure. Endurance training modifies several features of slow oxidative fibers to make them even more efficient. As a result, we can categorize general nervous system fibers based on four general functional modalities: Anatomy 337 eReader by Rice University is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted. These structures have two important roles. Endurance training modifies several features of slow oxidative, fibers to make them even more efficient. Structural Organization of the Human Body, Elements and Atoms: The Building Blocks of Matter, Inorganic Compounds Essential to Human Functioning, Organic Compounds Essential to Human Functioning, Nervous Tissue Mediates Perception and Response, Diseases, Disorders, and Injuries of the Integumentary System, Exercise, Nutrition, Hormones, and Bone Tissue, Calcium Homeostasis: Interactions of the Skeletal System and Other Organ Systems, Embryonic Development of the Axial Skeleton, Development and Regeneration of Muscle Tissue, Interactions of Skeletal Muscles, Their Fascicle Arrangement, and Their Lever Systems, Axial Muscles of the Head, Neck, and Back, Axial Muscles of the Abdominal Wall and Thorax, Muscles of the Pectoral Girdle and Upper Limbs, Appendicular Muscles of the Pelvic Girdle and Lower Limbs, Basic Structure and Function of the Nervous System, Circulation and the Central Nervous System, Divisions of the Autonomic Nervous System, Organs with Secondary Endocrine Functions, Development and Aging of the Endocrine System. Both voluntary and involuntary muscular system functions are controlled by the nervous system. The I and H bands appear lighter and they represent regions which consist of only thin or thick filaments respectively, but not both.