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Card 13 / 27: How would muscle contractions be affected if ATP was completely depleted in a muscle fiber?
Answer:
Without ATP, the myosin heads cannot detach from the actin-binding sites. All of the "stuck" cross-bridges result in muscle stiffness. In a live person, this can cause a condition like "writer's cramps." In a recently dead person, it results in rigor mortis.
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Attribution:
OpenStax College. Anatomy & Physiology, OpenStax-CNX Web site. http://cnx.org/content/col11496/1.6/, Jun 11, 2014
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