Eeeeeeeerrrrrrrrrrrrr! Yes I should stop before I say something horrible, you know what I mean >.>. So, this blog is not about those silly boys, its about muscular system. I just made a sexy introduction so I’d get your attention. READ IT TIL THE END. Ok?!
As I listen to the reporter I knew what muscles are, there are the general term for contractile tissue. Muscular system allows an alternate contraction and relaxation which causes movement. Muscles cells are elongated fibres.
There are three major types of muscles: skeletal, smooth, and cardiac muscles. Skeletal muscles are under conscious which means they are voluntary and are attached to the bones. The fibres in this muscles are striated, means stripped muscles. Skeletal muscles also allow movements. Unlike skeletal, smooth muscles are not under conscious control which means involuntary, it doesn’t have the striped appearance of skeletal muscles, it is the muscle of organs or sometimes called visceral muscles, and it facilitates the movement of blood. The last type is the cardiac muscle which can be found in the heart obviously, it has striated appearance but involuntary, and it makes up the walls of the heart and causes it to contract.
In this lesson the reporter also discussed movement as it relates to muscles. For example, Rotation describes circular movement; Abduction means to move away from the body; Adduction occurs when you produce a movement towards the body; Extension is used for increasing the angle between two bones, while Flexion is the opposite.
The reporter also explored the makeup of the muscle fibres to let us know how contraction works does. Muscles consist of elongated cells called muscles fibres. Each muscle fibre contains myofibrils, and these myofibrils are bundled together to form a muscle cell. Contraction rakes place from functional contractile units called sarcomeres. Sacromeres has two types of threadlike structure called thick and thin myofilaments. Thick myofilaments are composed of protein myosin, and the thin ones are composed of protein actin. The striated appearance of the muscles is called Z-lines.
There are common disorders occurring the muscular system. Here re just few examples: Fibromyalgia, Myalgia, Ataxia, Paralysis, Spasm or Cramps, Sprains, Hernia, Tendinitis, Myasthenia gravis and so many more.
I’d like to comment about the way this was reported. Such a mess, no visual aids or something that can make a listener get interested in the discussion. I wasn’t able to understand the lecture so I have to read it by my own. (WTH) I got mad because we had a quiz which I’m not ready to take because of not knowing what the reporter is saying in front of me. >,< grr!
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