CCH A short explanation of heart action

 A short explanation of heart action

Blood fills the  upper chambers from the  superior  and  inferior vena cava and  the  pulmonary veins

SA node generates a rhythmic electrical impulse automatically
 from it  there are  3 bundles which spread the  current  to  both atrial chambers
then  the
- electricity hits AV node and waits for a short time
- blood from atria fill ventricles
-; AV node impulse stimulates ventricles
-ventricles contract
- blood is pushed out of heart to body

https://www.youtube.com/watch?v=BgaFZa1zXgI
 A diagrammatic video about heart action made by  an  indian using  text to speech there are a few word which do not make sense.

now for some fun

How to draw a Heart diagram

https://www.youtube.com/watch?v=rMcWrbaj0R0

Heart parts Musical quiz

https://www.youtube.com/watch?v=T2iVqTckmPQ