BIOL 207 Lecture Notes - Lecture 20: Phosphate, Sarcomere, Cellular Respiration
26 Nov 2016
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Document Summary
Troponin and tropomyosin are referred to as t-t complex. Proteins have basic contractile unit known as sarcomere. Sarcomere lined up in tangents across muscle cell- know as myofibril. Actin binding site: cross bridge is attached to actin - dot. Atp binding site atp binds to cross bridge x. Cross bridge has atpase capability - it is an enzyme- splits atp: Because of splitting of high energy bond, energy is released. Atp splitting - a-d-p + pi (inorganic phosphate) Body heat is a result of atpase. In resting muscle cell: adp + pi are recycled cellular respiration to form new atps. T-t complex function covers myosin binding site on actin filament. Cross bridges automatically attach once t-t is pushed aside. Expose myosin binding site and cross bridges connect. New name for actin and myosin complex: actomyosin. Actomyosin cross bridges are connected to actin. Actomyosin one complex when cross bridges attach, power stroke. High energy, unstable, and short lived complex.
