Question

what is septum and explain...?​

Answer 1

That portion of the septum that separates the two upper chambers (the right and left atria) of the heart is termed the atrial (or interatrial) septum while the portion of the septum that lies between the two lower chambers (the right and left ventricles) of the heart is called the ventricular (or interventricular

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Answer 2

septum means a partition separating two chambers , such as that between the nostrils or the chambers of the heart