\documentclass[10pt,a4paper]{article}

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\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{kenny777}
\pdfinfo{
  /Title (cardiac-muscle.pdf)
  /Creator (Cheatography)
  /Author (kenny777)
  /Subject (Cardiac Muscle Cheat Sheet)
}

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% Commands
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% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\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}{kenny777} via \textcolor{DarkBackground}{\uline{cheatography.com/212877/cs/46354/}}}
\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}kenny777 \\
  \uline{cheatography.com/kenny777} \\
  \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 26th May, 2025.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
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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
\footnotesize % Small font.

\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Anatomy Of The Heart}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\emph{4 chambers:}}} \tn 
% Row Count 1 (+ 1)
% Row 1
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\mymulticolumn{1}{x{5.377cm}}{left and right {\bf{atria}}} \tn 
% Row Count 2 (+ 1)
% Row 2
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\mymulticolumn{1}{x{5.377cm}}{left and right {\bf{ventricles}}} \tn 
% Row Count 3 (+ 1)
% Row 3
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\mymulticolumn{1}{x{5.377cm}}{{\emph{4 heart valves:}}} \tn 
% Row Count 4 (+ 1)
% Row 4
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\mymulticolumn{1}{x{5.377cm}}{right AV valve (tricuspid)} \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{left AV valve (bicuspid)} \tn 
% Row Count 6 (+ 1)
% Row 6
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\mymulticolumn{1}{x{5.377cm}}{pulmonary/semilunar valve} \tn 
% Row Count 7 (+ 1)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{aortic/semilunar valve} \tn 
% Row Count 8 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.44333 cm} x{3.53367 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Flow of Blood}}  \tn
% Row 0
\SetRowColor{LightBackground}
Right atrium: & receives oxygen-poor blood from systemic circulation from {\bf{inferior and superior vena cavas}} then pumps blood into {\bf{right ventricles}} from {\bf{right AV valve}} \tn 
% Row Count 6 (+ 6)
% Row 1
\SetRowColor{white}
Right ventricle: & receives oxygen-poor blood from right atrium then pumps blood through the {\bf{pulmonary valve}} into {\bf{pulmonary arteries}} \tn 
% Row Count 11 (+ 5)
% Row 2
\SetRowColor{LightBackground}
Left atrium: & receives oxygen-rich blood from pulmonary circulation then into {\bf{left and right pulmonary veins}} and pumps blood through the {\bf{left AV valve}} into the left ventricle \tn 
% Row Count 17 (+ 6)
% Row 3
\SetRowColor{white}
Left ventricle: & receives oxygen-rich blood from left atrium then pumps blood through the {\bf{aortic valve}} into the {\bf{aorta}} which will go to the rest of the body \tn 
% Row Count 23 (+ 6)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Purpose of Heart Valves}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{ensures one way blood flow} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{when pressure is greater behind valve it {\bf{opens}}} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{when pressure is greater in front of valve it {\bf{closes}}} \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{has {\bf{chordae tendineae}} which prevents valves from everting on itself during ventricular contraction} \tn 
% Row Count 7 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.59264 cm} x{3.38436 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Heart Sounds \& Definitions}}  \tn
% Row 0
\SetRowColor{LightBackground}
murmurs: & abnormal heart sounds due to malfunctioning valves \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
stenotic valve: & stiff narrow valve that does not open completely, {\bf{whistling}} sound \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{insufficient} valve: & valve that does not close properly, {\bf{swishing}} sound \tn 
% Row Count 7 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{first heart sound (lub) -\textgreater{} closure of {\bf{AV valve}} \newline second heart sound (dup) -\textgreater{} closure of {\bf{semilunar valve}}}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.29402 cm} x{3.68298 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Regulation Of Cardiac Output}}  \tn
% Row 0
\SetRowColor{LightBackground}
Heart rate: & regulated by {\bf{parasympathetic}} and {\bf{sympathetic}} nervous system \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
Stroke volume: & volume of venous blood returning to the ventricles \tn 
% Row Count 5 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Cardiac Output = {\bf{heart rate}} X {\bf{stroke volume}}}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
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\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{AP of Pacemaker Cells}}  \tn
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\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/kenny777_1748129796_Screenshot 2025-05-24 163513.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Key: \newline I\textasciitilde{}f\textasciitilde{} - Funny Channels  \newline T - Transient Type Calcium Channels \newline L - Long Lasting Calcium Channels}  \tn 
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{AP of Cardiac Cell}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/kenny777_1748130498_Screenshot 2025-05-24 164758.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.9908 cm} x{2.9862 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Pacemaker Definitions And Terms}}  \tn
% Row 0
\SetRowColor{LightBackground}
Nodes: & specialized cardiac cells capable of pacemaker activity are grouped together to form nodes \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
Sinoatrial (SA) Node: & located in the {\bf{wall of the right atrium}}, able to conduct {\bf{70}} AP for minute \tn 
% Row Count 8 (+ 4)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{Atrioventricular} (AV) Node: & located in the at the {\bf{base of the right atrium}}, able to conduct {\bf{50}} AP for minute \tn 
% Row Count 12 (+ 4)
% Row 3
\SetRowColor{white}
Bundle of HIS & located at the AV nodes and {\bf{projects into the left and right ventricles}} \tn 
% Row Count 16 (+ 4)
% Row 4
\SetRowColor{LightBackground}
Purkinje Fibers & small fibers that extend from the Bundle of HIS, able to conduct {\bf{30}} AP for minute \tn 
% Row Count 20 (+ 4)
% Row 5
\SetRowColor{white}
Interatrial Pathway & conducts pacemaker activity from the {\bf{right atrium to the left atrium}} \tn 
% Row Count 23 (+ 3)
% Row 6
\SetRowColor{LightBackground}
Internodal Pathway & conducts pacemaker activity from the {\bf{SA node to the AV node}} \tn 
% Row Count 26 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Flow of AP}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{SA node -\textgreater{} AV node -\textgreater{} Bundle of HIS -\textgreater{} Purkinje Fibers% Row Count 2 (+ 2)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.14471 cm} x{3.83229 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Heart Walls Definitions}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{Endocardium:} & thin layer of endothelial tissue lining the interior of each chamber \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\seqsplit{Myocardium:} & middle layer of the heart, has {\bf{intercalated disks}} with {\bf{desmosomes}} and {\bf{gap-junctions}} \tn 
% Row Count 7 (+ 4)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{Epicardium:} & thin external membrane covering the heart and filled with {\bf{pericardial fluids}} to protect the heart \tn 
% Row Count 11 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.19448 cm} x{3.78252 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Electrocardiogram Waveforms}}  \tn
% Row 0
\SetRowColor{LightBackground}
P-wave: & {\emph{depolarization}} of the atria \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
QRS Complex: & {\emph{depolarization}} of the {\emph{ventricles}} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
T-wave: & {\emph{redepolarization}} of the {\emph{ventricles}} \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}{Electrocardiogram}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/kenny777_1748130817_Screenshot 2025-05-24 165148.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{PR = AV Nodal Delay \newline ST = Time when ventricles are contracting \& emptying \newline TP = Time when ventricles are relaxing \& filling}  \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 Image}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/kenny777_1748131354_Screenshot 2025-05-24 170205.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.43873 cm} x{2.53827 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Mechanicals Events of the Cardiac Cycle}}  \tn
% Row 0
\SetRowColor{LightBackground}
Systole: & periods of contraction \& emptying \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Diastole: & periods of relaxing \& filling \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
End-diastolic volume: & volume of blood at the end of diastole \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
isovolumetric ventricular contraction: & period of time during contraction where the chambers are {\bf{closed}} and the chamber pressure {\bf{increases}} \tn 
% Row Count 12 (+ 6)
% Row 4
\SetRowColor{LightBackground}
End-systole volume: & the amount of blood remaining at the end of systole \tn 
% Row Count 15 (+ 3)
% Row 5
\SetRowColor{white}
Stroke volume: & end-diastole volume minus end systole volume \tn 
% Row Count 18 (+ 3)
% Row 6
\SetRowColor{LightBackground}
isovolumetric ventricular relaxation: & period of time during relaxation when chamber remains {\bf{closed}} and the chamber pressure {\bf{decreases}} \tn 
% Row Count 24 (+ 6)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}