A patch of nodal tissue present in the _______________ of the ____________ (C) is called the ________________ (B). Another mass of nodal tissue seen in the ______________________ called the ________________________ (D) .

( a ) left upper corner of the right atrium, atrio-ventricular node (AVN); lower left corner of the right atrium close to the atrio-ventricular septum, sino-atrial node (SAN)
( b ) right upper corner of the right atrium, sino-atrial node (SAN); lower left corner of the left atrium close to the atrio-ventricular septum, atrio-ventricular node (AVN)
( c ) left upper corner of the right atrium, sino-atrial node (SAN); lower left corner of the right atrium close to the atrio-ventricular septum, atrio-ventricular node (AVN)
( d ) right upper corner of the right atrium, sino-atrial node (SAN); lower left corner of the right atrium close to the atrio-ventricular septum, atrio-ventricular node (AVN)

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A patch of nodal tissue present in the _ of the (C) is called the (B). Another mass of nodal tissue seen in the called the ____________ (D) .

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