KINE 1020 Lecture Notes - Lecture 2: Motor Unit, Serca, Troponin
10 Jan 2017
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Movement only comes with the force is greater than the load. This is why the latency period is longer with heavy weights because you have to wait till you build up more and more force until you can overcome the load. The heavier the load, the less each myosin head will be able to move which is why at heavier loads the velocity of shortening is shorter. In a single bre the contraction time depends on the type of myosin present. There are type 1 and type 2 myosin. The reason a type 1 bre is called a slow bre is because the physical type. These are all intracellular explanations of how force is generated other extracellular explanations (outside the cell: muscle length, ap frequency, number of bres per motor unit and sectional area of each bre, number of motor units recruited.
