Final answer:
The intra atrial tract, also known as Bachmann's bundle, is the conduction pathway that carries an impulse from the SA node in the right atrium directly to the left atrium, distinct from the atrioventricular septum.
Step-by-step explanation:
The intra atrial tract, also known as Bachmann’s bundle, is a pathway that conducts an impulse directly from the SA node in the right atrium to the left atrium. This pathway plays a crucial role in ensuring that the atria contract in a coordinated manner. The interatrial septum is the cardiac septum located between the right and left atria, and it contains specialized conduction pathways including the intra atrial tract. However, it is distinct from the atrioventricular septum, which is the septum located between the atria and the ventricles and is where the atrioventricular valves are situated, such as the tricuspid valve between the right atrium and right ventricle.