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English to Spanish translations [PRO] Medical - Medical (general) / muscle contraction
English term or phrase:power stroke
Mechanism of muscle contraction:
Once action potential or motor nerve reaches muscle, actin and myosin fibrils glide on each other, causing muscle to contract. Myosin molecule us a helix (2 protein chains) with a tail that ends in a "head". Myosin filament, made up of approximately 200 molecules, in a bundle alternatin with parallel actin filaments that glide on each other. Actin is 2-strand helix, with one containing tropomysin. Troponin molecules attach to fibril. Actin filament and its troponin-tropomisin complex are neutralized, and contraction begins.
Contraction is assumed to occur ad head of filament rotates about pivot site, causing "hinge" (tail-head filament of myosin molecule) to slide on actin filament. This is called "power stroke".
Me perdonarán el sermón :o) pero creo que merecía la pena dar un contexto amplio.
No es que me haya levantado preguntona, es que estoy al final de un proyecto de tres meses y es ahora cuando vuelvo sobre las palabras que no logré descifrar.