"X" is a fibrous tissue which separates the heart into left and right side. Identify "X".
A
Sino atrial node
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B
Atrioventricular septum
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C
Atrioventricular node
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D
Interventricular septum
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Solution
The correct option is B Atrioventricular septum The atrioventricular septum is the middle portion of the cardiac wall that divides the heart into left and right sides.