Question

The most inferior portions of the heart is called the:

a) apex.
b) volar.
c) dorsum.
d) base.

Answer 1

The most inferior part of the heart is called the apex, and it is the tip that points downwards and to the left. The base of the heart, in contrast, is the superior surface connecting to the aorta and pulmonary trunk.

Step-by-step explanation:

The most inferior portion of the heart is known as the apex. The apex is the tip of the heart that points down and to the left. When one listens to the heart using a stethoscope, the apex is the best location to hear the sounds produced during the cardiac cycle. In contrast, the superior surface of the heart, which attaches to the great vessels like the aorta and pulmonary trunk, is called the base.

Regarding the other questions provided for context:

• The right ventricle sends blood to the lungs (c).
• The pulmonary trunk and aorta are derived from the bulbus cordis (a).
• The primitive area of the heart that gives rise to the right ventricle is the truncus arteriosus.
• The two tubes that eventually fuse to form the heart are referred to as the endocardial tubes (b).
• The first heart sound represents ventricular systole (b).