What is the function of nodal muscular tissue ?

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Definition / Explanation :

$(1)$ $AV$ valve (Tricuspid) 

$(2)$ Mitral (Bicuspid) valves 

Give difference : Atrium and Ventricles

Definition / Explanation :

$(1)$ Semi lunar valve 

In the heart of mammal the bicuspid valve is situated between

Draw a labelled diagram showing internal structure of heart.