Tasks on the theme - 45 minutes. · Biophysics of muscle contraction
· Biophysics of muscle contraction. · Structure of cross-striated muscle. · Sliding filament model. · Muscle biomechanics. · Hill’s equation. · Power of a single contraction. · Modeling of the muscle contraction. · Electromechanical conjugation. Break - 10 minutes Students’ independent work - 30 minutes Explain the context and find the ways of solving the problems. Transform the formula and convert the unit of physical quantities to the International System of Units. Problems: 1. Determine the absolute elongation of a tendon with 4 mm length and 10-6 m2 sectional area under the force 320 N. Consider that elastic module of the tendon is 109 Pa and the tendon is absolutely elastic. 2. Determine the limit of bone strength with 30 mm diameter and 3 mm thickness if for its destroying it is necessary 400 kN force. 3. How will the elastic module of human femur change if at the tension of 5 Pa relative deformation is 0,025 and at the increasing of tension till 11 Pa it is 0,055? 4. What work is done at the dilatation of sartorius muscle of a frog (length is 30 mm) for 6 mm if it is known that at the 1 g load it stretches for 3 mm? Consider that the sartorius muscle is absolutely elastic. 5. Elastic module of protoplasmic filaments obtained by drawing out of protoplasm from some types of cells using the microneedles is 9*103 Pa at room temperature. Determine the tension that emerges in the thread at the stretching not exceeding 20% from its initial length. Consider that threads are elastic.
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