Title: Chapter 9 Mastering A&P Flashcards | Quizlet
Headings: Chapter 9 Mastering A&P
Chapter 9 Mastering A&P
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Content: As the action potential spreads down the T tubules of the triads, voltage-sensitive tubule proteins change shape. How does the shape change of these proteins lead to contraction? It allows calcium to exit the sarcoplasmic reticulum and enter the cytosol. Which selection correctly describes the role of calcium in coupling? Calcium binds to troponin, which moves tropomyosin and exposes the myosin-binding sites on actin. Which selection best describes the initial event in contraction? Myosin heads bind to the newly exposed myosin-binding sites on actin to form cross bridges
cistern
swollen chamber of an organelle that lies on either side of the T-tubules
voltage-sensitive tubule proteins
a protein that changes shape as a direct result of an action potential
T tubules
a structure that forms a path from the membrane to cells interior
Troponin
protein that binds calcium
excitation-contraction coupling to the correct order
1. An action potential is generated
at the sarcolemma. 2. Action potential goes down the T tubule.