Function of muscle - seems
Vitamin D deficiency may cause poor muscle function, particularly in older adults, according to a new study by Australian researchers. Those findings suggest that preventing vitamin D deficiency in older adults could help maintain better muscle strength and function and reduce age related muscle deterioration, although further studies are needed to confirm this. We are particularly interested to examine whether this reduction in mitochondrial function may be a cause of age related loss in skeletal muscle mass and function. The study was published Friday in the Journal of Endocrinology. Login Register. Tweets by mcknightsltcn. Popular Emailed Recent Loading function of muscleFunction of muscle Video
Musculoskeletal System - Muscle Structure and FunctionMotion i. Movements of the body as a whole, brought about by muscles because they possess the property of contraction and relaxation.
The muscles composed of mainly of muscular tissue which, like other tissues of the body, consists of cells and intercellular substance. The cells of the muscular tissue are very much elongated. Therefore, generally refers to as muscle fibers. The muscle cells are also sometimes referring to as myocytes. Functino end relaxation of muscles leads to locomotive movements of whole of the body like walking function of muscle running. Many other movements produced by muscles are less noticeable, e.
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click Contraction of the muscles holds the body in stationary positions like standing and sitting. Muscle contractions produce heat and thus play an important role in maintaining normal body temperature. Generally, the muscular tissue is classified into three main types: 1 skeletal muscle, 2 smooth muscle, and 3 cardiac muscle. It must however, be noted that there is no function of muscle basis for the classification of muscular tissue.
Types of Muscular Tissues
The name of first variety skeletal muscles is on the basis of its attachment to the skeleton. The name of the second type smooth muscle is based upon its microscopic structure.
The third variety cardiac muscle is titled on the basis of its location in the body cardiac is a Greek word meaning pertaining to function of muscle. Developmentally, all the three varieties of muscle tissue, i. As indicated by their title. When examined under microscope, the skeletal muscle fibers seen as elongated, non-branching, multinucleated cells that show transversely arranged alternating dark and light bands function of muscle give these cells a conspicuously striated appearance. Although the cardiac muscle shows cross striations vide infrathe striated appearance regarded to a characteristic feature of the skeletal muscle. This generally, the term striated muscle regards to analogous with skeletal muscle. Functionally, the skeletal muscle also titled as voluntary muscle because it can make to contract by conscious control.
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However, some skeletal muscles involves in production of movements that operates at an unconscious level, e. However, some skeletal muscles of the head and neck region which develop from the branchial pharyngeal arches designate as special visceral muscles, e. Each smooth muscle fiber is a long, slender, spindle-shaped cell containing a single nucleus, which is located in the central wider part of the cell. As mentioned above, no cross-striations are visible in the smooth muscle cells; hence this variety of muscle tissue is also known as non-striated muscle. Unlike skeletal muscle, the smooth muscle is not connecting to bones. Instead, the smooth muscle fibers usually form sheets in the walls of the hollow organs, e. Because of its location in the walls of the hollow viscera, the smooth muscle is also titled as visceral muscle.
Cardiac muscle tissue is found only in the wall of the heart where it is known as myocardium. The cardiac muscle fibers are made up of function of muscle, cylindrical segments cells joined end to end by intercellular junctions. Each segment contains one nucleus located in the central region of the cell. The cardiac function of muscle cells also show cross-striations due to the presence of alternating dark and light bands.]
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