Question

question
the heart border indicated by the image below is formed________.
answer
by the right atrium
mainly by the inferior wall of the right ventricle
mainly by the left ventricle
by the base of the heart
i dont know yet

Explanation:

The right heart border is formed by the right atrium. The left heart border is mainly formed by the left ventricle. The inferior border is mainly formed by the inferior wall of the right ventricle. The base of the heart is the posterior part.

Answer:

by the right atrium