Question

______ is the opening of the upper chamber of the heart into the lower chamber.

विकल्प

• Atria-ventricular septum

• Atria-ventricular aperture

• Sino-auricular aperture

• Atria-ventricular node

Answer 1

Atria-ventricular aperture is the opening of the upper chamber of the heart into the lower chamber.

Explanation:

The atrioventricular opening connects each atrium (upper chamber) to the ventricle (lower chamber).