#Hand of fate 2 twitch series#
In single fibres, however, most of the elasticity of the series of elastic elements is contributed by the actin-myosin cross bridges themselves. The attachment of the muscle fibres to the tendons at the end of the muscle and the attachment of the thin filaments to the Z line contribute to this elastic component. Within the muscle, many elastic structures, connected in series with the contractile elements, are stretched during contraction. Usually, the maximum tetanus tension is from 1.2 to 1.8 times greater than the maximum tension during a twitch. The exact rate depends upon the particular muscle and the temperature. This latter type of contraction is called a fused tetanus, and the rate of stimulation that produces it is called the fusion frequency. It is possible to stimulate the muscle at a frequency between these extremes so that the tension developed by the muscle remains constant. If, however, the pulses are 300 milliseconds apart, the muscle will be relaxing when the second pulse is given, and the tension will appear in waves in phase with the stimulation, causing an unfused tetanus.
Therefore, a second pulse within that time span will not elicit any response. This absolute refractory period in the frog sartorius at 0 ☌ lasts about 10 milliseconds after stimulation. Muscle, like other excitable tissues, has a period following its action potential during which the membrane will not respond to stimulation regardless of the strength. The mechanical response to repeated stimulation depends on the rate of the stimulation. More happens during this mechanical response to a single stimulation, called a twitch, than the tension record suggests.
If the ends of a frog sartorius muscle (at 0 ☌) are fixed to prevent shortening, the tension increases for about 200 milliseconds and then begins to decrease, at first rather rapidly and then more slowly. Skeletal muscles respond to a single electric shock of sufficient magnitude by rapid, intense contractions called phasic contractions. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.
#Hand of fate 2 twitch how to#
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