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% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
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% Document Info
\author{rose208347}
\pdfinfo{
  /Title (cardiac-muscle.pdf)
  /Creator (Cheatography)
  /Author (rose208347)
  /Subject (Cardiac Muscle Cheat Sheet)
}

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\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Cardiac Muscle Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{rose208347} via \textcolor{DarkBackground}{\uline{cheatography.com/213602/cs/46503/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}rose208347 \\
  \uline{cheatography.com/rose208347} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 28th May, 2025.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
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  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
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% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
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\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Heart Chambers}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{} \tn 
% Row Count 0 (+ 0)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Left Atria: oxygen- {\bf{rich}} blood from pulmonary veins -\textgreater{} left AV valve  \newline Right Atria: oxygen {\bf{poor}} blood from vena cavae -\textgreater{} right AV valves \newline Left Ventricle: oxygen {\bf{rich}} blood, from right at-{}-\textgreater{} semilunar valves  \newline Right Ventricle: oxygen {\bf{poor}} blood from rigth atrium-\textgreater{} pulmonary artery}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.19002 cm} x{1.19002 cm} x{2.19696 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{5.377cm}}{\bf\textcolor{white}{Nodes}}  \tn
% Row 0
\SetRowColor{LightBackground}
SA Node & AV node & Bundle of His \tn 
% Row Count 1 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\SetRowColor{LightBackground}
\mymulticolumn{3}{x{5.377cm}}{SA node \newline initiates potential and {\bf{leads}} \newline audtorhythmicity: 70 action potentials per minute  \newline  \newline AV node  \newline base of right atrium  \newline audtorhythmicity: 50 A.P. / minute \newline {\bf{follows}} SA node under normal conditions \newline  \newline Bundle of His \newline origin: AV node \newline projects to left and right ventricles \newline  \newline Purkinje Fibers \newline terminal fibers \newline extend from Bundle of His \newline follows faster SA node under normal conditions}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Cardiac Cycle}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Systole} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{contraction} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Diastole} \tn 
% Row Count 3 (+ 1)
% Row 3
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\mymulticolumn{1}{x{5.377cm}}{relaxation} \tn 
% Row Count 4 (+ 1)
% Row 4
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\mymulticolumn{1}{x{5.377cm}}{End- diastolic volume} \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{volume of blood at end of diastole, max amount that chamber will hold} \tn 
% Row Count 7 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Isovolumetric ventricular contraction} \tn 
% Row Count 8 (+ 1)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{during contraction, valves closed, no blood leaves, increase in chamber pressure} \tn 
% Row Count 10 (+ 2)
% Row 8
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\mymulticolumn{1}{x{5.377cm}}{Stroke volume} \tn 
% Row Count 11 (+ 1)
% Row 9
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\mymulticolumn{1}{x{5.377cm}}{amount of blood pumped out of chamber} \tn 
% Row Count 12 (+ 1)
% Row 10
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\mymulticolumn{1}{x{5.377cm}}{Isovolumetric ventricular relaxation} \tn 
% Row Count 13 (+ 1)
% Row 11
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\mymulticolumn{1}{x{5.377cm}}{chamber pressure decreases} \tn 
% Row Count 14 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{ACh:  Parasympathetic release}}  \tn
% Row 0
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\mymulticolumn{1}{x{5.377cm}}{SA Node} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Ach: inc. permeability to K+ by delaying inactivation of K+ channels -\textgreater{} more hyperpolarization} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{AV Node} \tn 
% Row Count 4 (+ 1)
% Row 3
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\mymulticolumn{1}{x{5.377cm}}{inc permeability to K+, reduces excitability of node, delays response of input from SA node} \tn 
% Row Count 6 (+ 2)
% Row 4
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\mymulticolumn{1}{x{5.377cm}}{Atrial contractile cells} \tn 
% Row Count 7 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{shortens of action potentials: reducing Ca2+ permeability during plateau} \tn 
% Row Count 9 (+ 2)
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{1.00694 cm} x{2.56312 cm} p{1.00694 cm} }
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\mymulticolumn{3}{x{5.377cm}}{\bf\textcolor{white}{Components}}  \tn
% Row 0
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Heart & Blood Vessels & Blood \tn 
% Row Count 1 (+ 1)
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\par\addvspace{1.3em}

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\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{5.377cm}}{\bf\textcolor{white}{Valves : one way}}  \tn
% Row 0
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Right AV Valve & Left AV valve & Aortic/ Pulmonary valve \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
tricuspid & bicuspic & semilunar \tn 
% Row Count 3 (+ 1)
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\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Pathways}}  \tn
% Row 0
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% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{cardiac cells pacemaker activity from right to left atrium} \tn 
% Row Count 3 (+ 2)
% Row 2
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\mymulticolumn{1}{x{5.377cm}}{Internodal} \tn 
% Row Count 4 (+ 1)
% Row 3
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\mymulticolumn{1}{x{5.377cm}}{cardiac cell pacemaker activity from SA to AV node} \tn 
% Row Count 5 (+ 1)
% Row 4
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\mymulticolumn{1}{x{5.377cm}}{AV nodal delay} \tn 
% Row Count 6 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Slow through AV node due to thickness} \tn 
% Row Count 7 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Action potential in Contractile cells}}  \tn
% Row 0
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\mymulticolumn{1}{x{5.377cm}}{Resting potenial} \tn 
% Row Count 1 (+ 1)
% Row 1
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\mymulticolumn{1}{x{5.377cm}}{-90mV until excited} \tn 
% Row Count 2 (+ 1)
% Row 2
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\mymulticolumn{1}{x{5.377cm}}{Rising phase} \tn 
% Row Count 3 (+ 1)
% Row 3
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\mymulticolumn{1}{x{5.377cm}}{rapid, Na+ entry due to opening of fast Na+ channels, close K+ channels} \tn 
% Row Count 5 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Repolarization} \tn 
% Row Count 6 (+ 1)
% Row 5
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\mymulticolumn{1}{x{5.377cm}}{at peak, open transient K+ efflux, inactivate Na+ channels} \tn 
% Row Count 8 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Plateu} \tn 
% Row Count 9 (+ 1)
% Row 7
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\mymulticolumn{1}{x{5.377cm}}{Slow Ca2+ entry, open of L-type Ca2+ channels, reduce} \tn 
% Row Count 11 (+ 2)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Falling phase} \tn 
% Row Count 12 (+ 1)
% Row 9
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% Row Count 13 (+ 1)
% Row 10
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Resting Potential} \tn 
% Row Count 14 (+ 1)
% Row 11
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{maintained by opening leaky K+ channels} \tn 
% Row Count 15 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Heart Sounds}}  \tn
% Row 0
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\mymulticolumn{1}{x{5.377cm}}{Murmer:} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{turbulent flow of blood through malfunctioning valves} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Stenotic valve:} \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{whistling, stiff narrow valve} \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Insufficient valve:} \tn 
% Row Count 6 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{swishing, structurally damaged valve} \tn 
% Row Count 7 (+ 1)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Rheumatic fever:} \tn 
% Row Count 8 (+ 1)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{valvular stenosis, autoimmune disease} \tn 
% Row Count 9 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Cardiac muscle type}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Straited:} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{striped lines} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Involuntary} \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{moves by itself} \tn 
% Row Count 4 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Sarcomere}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Z line} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{sarcomere boundary} \tn 
% Row Count 2 (+ 1)
% Row 2
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\mymulticolumn{1}{x{5.377cm}}{A band} \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{thick filament with thin filament overlapp} \tn 
% Row Count 4 (+ 1)
% Row 4
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\mymulticolumn{1}{x{5.377cm}}{H zone} \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{where thin filaments don't reach} \tn 
% Row Count 6 (+ 1)
% Row 6
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\mymulticolumn{1}{x{5.377cm}}{M line} \tn 
% Row Count 7 (+ 1)
% Row 7
\SetRowColor{white}
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% Row Count 8 (+ 1)
% Row 8
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\mymulticolumn{1}{x{5.377cm}}{I band} \tn 
% Row Count 9 (+ 1)
% Row 9
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\mymulticolumn{1}{x{5.377cm}}{remaining thin filament that are not in A band} \tn 
% Row Count 10 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Muscle}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Myofibril:} \tn 
% Row Count 1 (+ 1)
% Row 1
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\mymulticolumn{1}{x{5.377cm}}{thin( actin) thick ( myosin), sarcomeres connected together} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Sarcomere:} \tn 
% Row Count 4 (+ 1)
% Row 3
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\mymulticolumn{1}{x{5.377cm}}{smallest unit of muscle cell,} \tn 
% Row Count 5 (+ 1)
% Row 4
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\mymulticolumn{1}{x{5.377cm}}{Myosin:} \tn 
% Row Count 6 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{cytoskeletal protein} \tn 
% Row Count 7 (+ 1)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Thin filament} \tn 
% Row Count 8 (+ 1)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{actin, tropomyosin, troponin} \tn 
% Row Count 9 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Types of Muscle}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{} \tn 
% Row Count 0 (+ 0)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{{\bf{Endocardium}} - thin/ interior of each chamber \newline {\bf{ Myocardium}} - middle layer, thickest, intercalated disks for connection  \newline {\bf{Epicardium}} - thin external membrane with pericardial fluid}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Pacemaker Activity}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{} \tn 
% Row Count 0 (+ 0)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Open funny channels:  \newline NA+ inward and closes K+ outward \newline Reaches threshold of -40:  \newline Open L-type Ca2+  and K+ channels}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Action potential in Contractile cells}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/rose208347_1748389453_IMG_1332.jpg}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{p{0.4977 cm} p{0.4977 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Electrical Activity}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{} \tn 
% Row Count 0 (+ 0)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{{\bf{Autorhythmicity}}- capability to produce own rhythmic electrical activity due to {\bf{ Pacemaker activity}} \newline Only 1\% of Cardiac cells}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Excitation Contraction Coupling}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Ca2+ entry into cystol} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{} \tn 
% Row Count 1 (+ 0)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{T-tubule} \tn 
% Row Count 2 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{contain: dyhyropyridine receptors-\textgreater{} open Ca2+ into cytosol} \tn 
% Row Count 4 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\#crossbridges proportional to cytosolic Ca2+ concentration} \tn 
% Row Count 6 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Electrocardiogram}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{P wave} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{depolarization of atria} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{QRS complex} \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{depolarization of ventricles} \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{T- wave} \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Repolarization of ventricles} \tn 
% Row Count 6 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Cardiac Output}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Cardiac Output:} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{heart rate x stroke volume} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Heart rate:} \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{beats per minute, regulated by both parasympathetic and sympathetic nervous system} \tn 
% Row Count 5 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Excitation Contraction Coupling}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{ACh} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{- released by motor neuron axon binds to motor end plate} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{- results in action potential that propagates to surface membrane and down t-tubule} \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{- triggers Ca2+ release from SR} \tn 
% Row Count 6 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{-Ca2+ released from lateral sacs} \tn 
% Row Count 7 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{- bind to troponin, tropomyosin moves aside to open actin binding site} \tn 
% Row Count 9 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{- myosin crossbridge attach to actin-\textgreater{} bend -\textgreater{} pull actin towards center of sarcomere} \tn 
% Row Count 11 (+ 2)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{- Ca2+ taken up by SR} \tn 
% Row Count 12 (+ 1)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{- tropomyosin goes back to blocking position.} \tn 
% Row Count 13 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}