If you clench your hand into a fist, this is approximately the same size as your heart. It is located in the middle of the chest and slightly towards the left. The heart is a large muscular pump ...

Researchers have produced unprecedented images of a ... to look at her baby's heart in vivid detail. It showed a narrowing of the main artery coming from the heart - the aorta - which would ...

The semilunar valves stop the back flow of blood into the heart. There is a semilunar valve where the aorta leaves the left ventricle and another where the pulmonary artery leaves the right ventricle.