Final answer:
The tissue present in the right ventricle and originating at the interventricular septum is the myocardium.
Step-by-step explanation:
The tissue that is present in the right ventricle and originates at the interventricular septum is the myocardium. The myocardium is the middle layer of the heart wall and is responsible for the contraction of the heart muscle. It is composed mainly of cardiac muscle fibers.