Types Of Muscle
Muscle, tissue or organ of the body characterized by the ability to contract, usually in response to a stimulus from the nervous system. The basic unit of all muscle is the myofibril, a minute, threadlike structure composed of complex proteins. Each muscle cell, or fiber, contains several myofibrils, which are composed of regularly arranged myofilaments if two types, thick and thin. Each thick myofilament contains several hundred molecules of the protein myosin. Thin filaments contain two strands of the protein actin. The myofibrils are made up of alternating rows of thick and thin myofilaments with their ends interleaved.
Humans have over 650 muscles, which differ in size according ...
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because it is not under voluntary control. Cardiac muscle is a special type of muscle found only in the heart. It consists of linked fibers that contract in unison producing the heartbeat.
Skeletal, or Striated Muscle Tissue:
This type of muscle is composed of long fibers surrounded by a membranous sheath, the sarcolemma. The fibers are elongated, sausage-shaped cells containing many nuclei and clearly display longitudinal and cross striations. Skeletal muscle is supplied with nerves from the central nervous system, and because it is partly under conscious control, it is also called voluntary muscle. Most skeletal muscle is attached to portions of the skeleton y connective-tissue attachments called tendons. Contractions of skeletal muscle serve to move the various bones and cartilages of the skeleton. Skeletal muscle forms most of the underlying flesh of vertebrates.
Smooth Muscle:
Visceral, or involuntary, muscle is composed of spindle-shaped cells, each having a central ...
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chemical waste products. The actual chemical process involves the breakdown of glucose to carbondioxide and water. This process releases energy which is used by the muscle proteins to cause contraction. This process is known as aerobic glycolysis and involves first the production of a 3-carbon substance, pyruvate, which when combined with oxygen, is broken down further to water and carbon dioxide by a cycle of enzymes in the mitochondria, the Krebs cycle. This chemical reaction requires a great supply of oxygen, which is often not available during intense exercise. During exercise, a muscle requires about fifty times more oxygen per minute than at rest. To overcome this low level ...
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Types Of Muscle. (2007, September 24). Retrieved December 23, 2024, from http://www.essayworld.com/essays/Types-Of-Muscle/71649
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"Types Of Muscle." Essayworld.com. September 24, 2007. Accessed December 23, 2024. http://www.essayworld.com/essays/Types-Of-Muscle/71649.
"Types Of Muscle." Essayworld.com. September 24, 2007. Accessed December 23, 2024. http://www.essayworld.com/essays/Types-Of-Muscle/71649.
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