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9:22
Khan Academy
Sal Khan
How tropomyosin and troponin regulate muscle contraction
Lean how calcium ion concentration dictates whether a muscle contracts or not. Explore how myosin II, using ATP, interacts with actin filaments to enable muscle contraction. Learn about the regulatory roles of proteins tropomyosin and troponin, and the crucial part calcium ions play in muscle contraction and relaxation. This is a deep look into ...
Feb 20, 2011
Troponin Structure
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Freemasonry’s structure works like a staged mystery drama. Each degree...Entered Apprentice, Fellow Craft, and Master Mason...unfolds as a three-act ritual with officers acting as performers and the candidate guided through the experience. After each act, a detailed catechism must be learned, a sequence of questions and answers that unlocks the meaning behind the symbols and actions. The system is layered by design: every degree adds new understanding onto what was learned before, revealing the
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