The Force of Muscle Contraction

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.

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----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)

Видео The Force of Muscle Contraction канала EmpoweRN