Atrioventricular septum is the surface indentation that separates the atria from the ventricles. 
<h3>What is an atrioventricular septum? </h3>
The interatrial and interventricular septal cross the atrioventricular annular plane and merge with the septum tricuspid and anterior mitral leaflet attachment at the septal atrioventricular junction, which is a critical region of the heart.
The tricuspid and mitral valves seem cruciate on a four-chamber view when both septa are converging, earning the term crux of the heart, cardiac crux, or crux cordis.
The atrioventricular septum, a septal component dividing the atria from the left ventricle, is a distinctive anatomic characteristic of the atrioventricular junction. 
Therefore, the atrioventricular septum is the indentation that separates the atria from the ventricles. 
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Answer: The concentration of salt is high and lacks hydration. 
Explanation: A cell must stay in homeostasis cellularly if the cell has shrunk its salt is too high and needs hydration.