Skeletal muscle contractions can be broadly separated into twitch, summation, and tetanic contractions. In a twitch contraction, a single action potential, whether from a motor neuron or from within the muscle, causes the muscle fiber to produce a single contraction and relaxation cycle called a twitch.uscle contractions can be described based on two variables: length and tension. A muscle contraction is described as isometric if the muscle tension changes but the muscle length remains the same. In contrast, a muscle contraction is isotonic if muscle length changes but the muscle tension remains the same.
Â© A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. Gutenberg discontinuity The seismic-velocity discontinuity between the Earth's mantle and core. The boundary is at a depth of about 2600 km and is thought to have surface irregularities of a few kilometres. Cite this article. Pick a style below, and copy the text for your bibliography.
The difference between a removable discontinuity and a vertical asymptote is that we have a R. discontinuity if the term that makes the denominator of a rational function equal zero for x = a cancels out under the assumption that x is not equal to a. Othewise, if we can't cancel it out, it's a vertical asymptote.im. 6 1. The key distinction between a removable discontinuity and a discontinuity which corresponds to a vertical asymptote is that $\lim_{x\to a}f(x)$ exists in the case of a removable discontinuity, but $\lim_{x\to a^{+}}f(x)$ or $\lim_{x\to a^{-}}f(x)$ is infinite in the case of a vertical asymptote.