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This Concept Map, created with IHMC CmapTools, has information related to: neuromuscular junction edited, transverse tubule and reaches sarcoplasmic reticulum, end of axon causes opening of <math xmlns="http://www.w3.org/1998/Math/MathML"> <mrow> <mmultiscripts> <mtext> Ca </mtext> <none/> <mtext> 2+ </mtext> </mmultiscripts> <mtext> voltage-gated
channel </mtext> <mmultiscripts> <mtext> </mtext> <none/> <mtext> </mtext> </mmultiscripts> </mrow> </math>, Describe the events at the neuromuscular junction and post synaptic cell which cause skeletal muscle to contract occurs when 1. Action potential, synaptic vesicles to fuse to presynaptic membrane, sarcoplasmic reticulum and stimulates release of <math xmlns="http://www.w3.org/1998/Math/MathML"> <mmultiscripts> <mtext> Ca </mtext> <none/> <mtext> 2+ </mtext> </mmultiscripts> </math>, <math xmlns="http://www.w3.org/1998/Math/MathML"> <mrow> <mmultiscripts> <mtext> Na </mtext> <none/> <mtext> + </mtext> </mmultiscripts> <mtext> ligand 
gated channels </mtext> </mrow> </math> and cause them to open 4. Sodium ions, depolarization of post-synaptic cells, exocytosis next, myofibril and bind to troponin, 3. Acetylcholine binds to <math xmlns="http://www.w3.org/1998/Math/MathML"> <mrow> <mmultiscripts> <mtext> Na </mtext> <none/> <mtext> + </mtext> </mmultiscripts> <mtext> ligand 
gated channels </mtext> </mrow> </math>, depolarization above threshold value produces action potential 5. Action potential, action potential 5. Action potential then spread through transverse tubule, acetylcholine by exocytosis, myosin head leads to powerstroke, Describe the events at the neuromuscular junction and post synaptic cell which cause skeletal muscle to contract will appear as Neuromuscular junction, postsynaptical membrane causing depolarization, 1. Action potential arrives at end of axon, 2. Calcium ions stimulate synaptic vesicles, 4. Sodium ions from extracellular fluid, extracellular fluid diffuse into cytosol