Channel: EmpoweRN

Category: Education

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Description: Muscles work by contracting, or in simpler terms, shortening. When the muscle shortens up, it will pull the bone it is attached to and movement happens. But how come some contractions are stronger than the others? What are the factors that affect the force of muscle contraction? In this video, we will discuss 4 factors affecting the force of muscular contraction: the number of the muscles, the size or the length of the muscles involved the frequency or strength of stimulus, and of course, the degree of muscle stretch. ***Learn how to study for Anatomy & Physiology, enjoy the music free version of this video in the -Study Zone- section and much more, go here: youtube.com/channel/UCmhPgswuoCd--XV4Lu34Kkw/join ----Credits----- Music: Pond5.com Visuals: canstockphoto.com pond5.com shutterstock.com Contributing writers and video editors: Ricardo Perez Michael Kostikin Victor Onyino Reference & Resources: Squire, J. M. (2016). Muscle contraction: Sliding filament history, sarcomere dynamics, and the two Huxleys. Global cardiology science & practice, 2016(2). Watanabe, S., Fukuhara, S., Fujinaga, T., & Oka, H. (2017). Estimating the minimum stimulation frequency necessary to evoke tetanic progression based on muscle twitch parameters. Physiological Measurement, 38(3), 466. SANDOW, A. (1965). Excitation-contraction coupling in skeletal muscle. Pharmacological reviews, 17(3), 265-320. Ebashi, S., & Endo, M. (1968). Calcium and muscle contraction. Progress in biophysics and molecular biology, 18, 123-183. (Ebashi & Endo, 1968)