DICTIONARY

• Actin: Protein that forms (with myosin) the contractile filaments of muscle cells, which is involved in the motion of other types of cells. 

This is an example of an Actin-Myosin Sliding Filament Theory

http://legacy.owensboro.kctcs.edu/gcaplan/anat/notes/api%20notes%20j%20%20muscle%20contraction.htm

• Muscle Contraction: Is the activation of tension-generating sites within muscle fibers. This action occurs via a series of repeated events. First, calcium binds to actin triggering a shape of troponin and revealing the myosin-binding sites of actin beneath tropomyosin. Myosin binds; ATP is split, releasing energy, resulting in deformation of myosin hinge region. Then, actin [bound to myosin] is pulled past myosin filament. Myosin binds new ATP and detaches from actin, resetting the myosin head. Without energy/ATP, muscular rigidity occurs. 
• Kinesin: Are head domains of ATPase activity and microtubule-binding site. They transport cargo vesicles and chromosomes during mitosis. This is different from dynein, which also transports cargo protein but associated with the beating of cilia and eukaryotic flagella. Kinesin is powered by the hydrolysis of ATP [thus ATPase]. 

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