Physiology 2130 Lecture 5: module 5 notes - muscles
10 Oct 2020
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3 subunits: troponin a, which binds to actin, troponin t, which binds to tropomyosin, troponin c, which binds with ca++ It is the splitting of atp that releases energy to the myosin that powers the contraction of the muscle: many myosin molecules are arranged to form one thick filament. In the muscle, the power stroke slides the actin past the myosin. It is very important to realize that neither the thin nor the thick filaments shorten during a muscle contraction. The adp and pi molecules are released from the myosin head: step 4 a new molecule of atp binds to the myosin heads, the cycle then repeats. Rigor mortis: rigor mortis begins 3-4 hours after death and the muscles become very stiff for about. 12 hours: this stiffness slowly disappears over the next 24-48 hours, results directly from the loss of atp in the dead muscle cells (dead cells do not produce.
