Skeletal muscle, is voluntary muscle anchored by tendons or sometimes by aponeuroses to bones, and is used to effect skeletal movement such as locomotion and to maintain posture. Skeletal striated muscle tissue is arranged in regular, parallel bundles of myofibrils containing the many contractile units known as sarcomeres, which give the tissue its striated (striped) appearance. In the uterine wall during pregnancy they enlarge in length from 70 to 500 micrometers. Vertebrate skeletal muscle tissue is an elongated striated muscle tissue with the fibres ranging in width from three to eight micrometers and in length from 18 to 200 micrometers. The transversely striated type is the most similar to the skeletal muscle in vertebrates. There are three types of muscle tissue in invertebrates that are based on their pattern of striation: transversely striated, obliquely striated, and smooth muscle. ![]() Skeletal and cardiac muscle are types of striated muscle tissue. There are three types of muscle tissue in vertebrates: skeletal, cardiac, and smooth. Structure Three distinct types of muscle (L to R): Smooth (non-striated) muscle in internal organs, cardiac or heart muscle, and skeletal muscle. Sub-categorization of muscle tissue is also possible, depending on among other things the content of myoglobin, mitochondria, and myosin ATPase etc. The different muscle types vary in their response to neurotransmitters and hormones such as acetylcholine, noradrenaline, adrenaline, and nitric oxide depending on muscle type and the exact location of the muscle. Reflexes are a form of non-conscious activation of skeletal muscles, but nonetheless arise through activation of the central nervous system, albeit not engaging cortical structures until after the contraction has occurred. Striated or skeletal muscle only contracts voluntarily, upon the influence of the central nervous system. These muscle types may be activated both through the interaction of the central nervous system as well as by receiving innervation from peripheral plexus or endocrine (hormonal) activation. Smooth and cardiac muscle contract involuntarily, without conscious intervention. Other tissues in skeletal muscle include tendons and perimysium. Skeletal muscle tissue consists of elongated, multinucleate muscle cells called muscle fibers, and is responsible for movements of the body. In vertebrates the three types are: skeletal or striated smooth muscle (non-striated) muscle and cardiac muscle. Muscle tissue varies with function and location in the body. Among many other muscle proteins present are two regulatory proteins, troponin and tropomyosin. Muscle tissue contains special contractile proteins called actin and myosin which interact to cause movement. Muscle is formed during embryonic development, in a process known as myogenesis. Muscle tissue gives skeletal muscles the ability to contract. Besides aiding in muscle development, testosterone helps fuel the reproductive system, increases bone mass, and helps grow body hair.Muscle is a soft tissue, one of the animal tissues that makes up the three different types of muscle. This occurs because of the hormone testosterone, which the body begins to produce at higher levels during puberty. Men typically have more developed muscle than women. Latissimus dorsi: This flat rectangular muscle of the back helps the arms rotate as well as move away from and toward the body. ![]() Deltoid: This muscle gives the shoulder its rounded shape as well as raises and rotates the arm.Serratus anterior: Located in the rib cage, this muscle keeps the shoulder blade against the chest wall and helps rotate the shoulder blade upward.Teres major: This muscle helps rotate the upper arm.Infraspinatus: This rotator cuff muscle helps raise and lower the arm. ![]()
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