Excitation-Contraction Coupling Phase in a Practice by drawing in circled numbers in the images below to match the steps I have summarized below. Summarize the events that occur during the skeletal muscle. Excitation-Contraction Coupling Phase: 1. When the end plate potential at the knob opens enough nearby Na*VGCS, on the sarcolemma, this stimulates an action potential (AP) on the sarcolemma. 2. This AP spreads down the sarcolemma and t-tubules. 3. When the AP reaches the cisterna, it twists a voltage sensitive protein called the dihydropyridine receptor (DHP receptor). The twisting physically opens a Ca*² channel called a ryanodine receptor (RyR receptor). 4. Ca*2 ions flow through the ryanodine receptor channel, out of the cisterna, and into the sarcoplasm (the cytoplasm of the skeletal muscle fiber) where they then diffuse and bind to troponin to begin the first step of muscle contraction.

Excitation-Contraction Coupling Phase in a Practice by drawing in circled numbers in the images below to match the steps I have summarized below. Summarize the events that occur during the skeletal muscle. Excitation-Contraction Coupling Phase: 1. When the end plate potential at the knob opens enough nearby NaVGCS, on the sarcolemma, this stimulates an action potential (AP) on the sarcolemma. 2. This AP spreads down the sarcolemma and t-tubules. 3. When the AP reaches the cisterna, it twists a voltage sensitive protein called the dihydropyridine receptor (DHP receptor). The twisting physically opens a Ca² channel called a ryanodine receptor (RyR receptor). 4. Ca*2 ions flow through the ryanodine receptor channel, out of the cisterna, and into the sarcoplasm (the cytoplasm of the skeletal muscle fiber) where they then diffuse and bind to troponin to begin the first step of muscle contraction.

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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