Essay On Muscle Fibres

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Muscle fibres.
There are three types of muscle fibres; type 1, type 2a and type 2b.

A. Type 1: These fibres are slow twitch or slow oxidative fibres and are red due to the presence of large volumes of myoglobin. They contract slowly but can contract repeatedly over long periods. These fibres would be suitable for an athlete such as a marathon runner because this is an endurance sporting event that requires you to use aerobic energy which relies on oxygen from the blood for the supply of energy.
B. Type 2a: These fibres are fast twitch or fast oxidative fibres and are red because of the large number of mitochondria and myoglobin present. They have a high capacity for generating ATP by using both anaerobic and aerobic metabolism as a result they produce
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The bicep brachii consists of two heads; the long head and short head. The long head originates at the supraglenoid tubercle above the socket of the scapula. The origin of the short head is at the carocoid process of the scapula. Both heads unite to form one large muscle at the interior side of the humerus and attach to the radial tuberosity (the insertion).

Difference and similarities between the different types of muscle and the different muscle fibre types:
There are many different groups of muscles and composition of muscle tissue in the human body. Different types of athletes usually have one predominant type of muscle fibre, that being the best kind that suits their sport. Each muscle fibre has its own characteristics for example type 1 fibres are red and striated and type 2b fibres are white and smooth looking.

Slow twitch fibres are smaller and develop less force than fast twitch fibres.
2a more prone to fatigue than type I fibers
Fast twitch 2b fibres are also white fibres but unlike 2a fibres they can only use anaerobic energy

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