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% Most of the following are not required for the majority
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% Document Info
\author{scpuerner}
\pdfinfo{
  /Title (muscle-contractions-nmj-skeletal-muscles.pdf)
  /Creator (Cheatography)
  /Author (scpuerner)
  /Subject (Muscle Contractions • NMJ • Skeletal Muscles Cheat Sheet)
}

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    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Muscle Contractions • NMJ • Skeletal Muscles Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{scpuerner} via \textcolor{DarkBackground}{\uline{cheatography.com/212518/cs/46182/}}}
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  \vspace{-2pt}scpuerner \\
  \uline{cheatography.com/scpuerner} \\
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 23rd April, 2025.\\
   Page {\thepage} of \pageref{LastPage}.
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  Measure your website readability!\\
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% Set font size to small. Switch to any value
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\mymulticolumn{3}{x{5.377cm}}{Muscle contraction begins when a motor neuron releases acetylcholine (ACh) at the neuromuscular junction (NMJ). This causes depolarization of the sarcolemma and triggers an action potential that travels along the T-tubules.}  \tn 
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\mymulticolumn{2}{x{5.377cm}}{The action potential stimulates the sarcoplasmic reticulum (SR) to release calcium ions (Ca$^{\textrm{2}}$⁺). These ions bind to troponin, causing tropomyosin to move and expose myosin-binding sites on actin.}  \tn 
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\mymulticolumn{2}{x{5.377cm}}{Myosin heads bind to actin, perform the power stroke, and shorten the sarcomere. ATP allows detachment and re-cocking. When the signal stops, Ca$^{\textrm{2}}$⁺ is reabsorbed and the muscle fiber relaxes.}  \tn 
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% That's all folks
\end{multicols*}

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