KNES 191A Study Guide - Midterm Guide: Electromyography, Excess Post-Exercise Oxygen Consumption, Acne Vulgaris
Document Summary
1-2 micrometers in width and 4-12 inches long: sarcomeres: smaller units of myofibrils. A z- line: the point at which the actin filaments from adjacent sarcomeres interweave to create lines: a bands (dark): composed to thick myosin filaments, overlapping with thin actin filament. An a-band also has a central region- h zone: consists of thick filaments but no thin filaments plus a thickening known as an m line: the segment that extends from the z line to the next. Calcium binds to troponin, which pulls tropomyosin towards calcium and uncovers myosin-binding site on actin: myosin head: actin-binding site & atp-binding site (includes enzyme atpase). Atp hydrolyzes (breaks down) into adp+p releasing energy in sarcoplasm: energy causes myosin head to release phosphate group (p) & bind w/ actin creating a cross- bridge, adp is released when cross-bridge is formed. Atp transfers energy to creatine, the energy transferred creates a high energy compound known as creatine phosphate.
