Action Potentials Traveling Down the Plasma Membrane of a Muscle

question 71

Multiple Choice

Action potentials traveling down the plasma membrane of a muscle fiber will next reach the _____ after leaving the T tubules.  

• A) mitochondria
• B) neuromuscular junction
• C) cytoskeletal system
• D) sarcoplasmic reticulum
• E) endomembrane system

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