PHYSICS 1L03 Chapter Notes - Chapter 3: Normal Force, Viscosity, Euclidean Vector
21 Mar 2018
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Document Summary
Smallest muscle unit that can contract: sarcomeres, made up of two types of protein filaments (parallel), actin. Anchored in z-disks and extend to both sides. Has binding sites for myosin: myosin. Bridge gap between actin of two adjacent z-disks. Consists of tail and specialized (myosin) head: each myosin filament is surrounded by 6 actin filaments. Actin allows cell to bear tensile (pulling) forces. Myosin acts as motor molecule by walking along actin rods: sliding filament model. Microscopic mechanism of muscle contraction: force. Produced by contraction of muscles as result of combining myosin and actin causes it. The addition is vector addition and resultant force called net force. Force changes velocity of object upon which it"s exerted. Restoring force: if you push or pull on a spring, it pushes or pulls back on you, brings object back to its unstretched/uncompressed position.
