<prompt> Right border of hea is formed by ?Right ventricleRight atriumSVCIVC  <response>: External features of hea The hea has following borders and surfaces :- A Borders i Right border :- Formed by right atrium. ii Left border obtuse margin:- Formed mainly by left ventricle and paly by left auricle in its upper most pa. iii Inferior border acute margin:- Formed mainly by right ventricle and paly by left ventricle near apex. iv Upper border :- Mainly by left atrium and paly by right atrium where SVC enters. v Apex :- Formed by left ventricle. B Surfaces i Anterior sternocostal surface :- Formed mostly by right ventricle major and right auricle and paly by left ventricle and left auricle. ii Inferior diaphragmatic surface :- It is formed by left ventricle left 23 and right ventricle right 13. It is traversed by posterior interventricular groove PIV containing PIV branch of RCA. 