A thin, muscular wall called the ____________________ separates the right and the left atria, whereas a thick-walled, ____________________ (H) , separates the left and the right ventricles. The atrium and the ventricle of the same side are also separated by a thick fibrous tissue called the _______________________ .

Question

( a ) atrio-ventricular septum, inter-ventricular septum; interatrial septum
( b ) inter-ventricular septum, atrio-ventricular septum; interatrial septum
( c ) interatrial septum, atrio-ventricular septum; inter-ventricular septum
( d ) interatrial septum, inter-ventricular septum; atrio-ventricular septum