BPK 205 Chapter Notes - Chapter 12: Endoplasmic Reticulum, Skeletal Muscle, Cardiac Muscle
15 Dec 2018
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12 skeletal muscle: three types of muscle tissue found in human body = skeletal, cardiac, and smooth. Make up about 40% of total body weight. Are more distal or mobile at the point of insertion than the point of origin. Are paired in antagonistic muscle groups called flexors and extensors: t-tubules allow action potentials to move to the interior of the muscle fiber, six proteins that make up myofibrils . Formed by 2 chains of f-actin intertwined; each g-actin has one myosin binding site. Myosin thick filament; produces the power stroke. Each myosin has one actin binding site and one atp binding site. Binds to tropomyosin and has 2 ca2+ binding sites. Attaches to actin covers up myosin binding sites on actin. Elastic molecule returns stretched muscles to their resting length after contraction. Spans distance from one z disk to next neighboring m line. Nebulin lies along thin filaments; helps align the actin filaments of the sarcomere.
