Historical biological theories tend to describe that behaviors are inherited biological tendencies passed down through evolution, and contemporary biosocial theories are explained by saying that genes and other biological features are more facilitators of human behavior instead of determinants.
Like the heart, the LVAD is a pump. One end hooks up to the left ventricle -- that's the chamber of the heart that pumps blood out of the lungs and into the body. The other end hooks up to the aorta, the body's main artery. A tube passes from the device through the skin.
The heart has four chambers that keep oxygen-depleted blood from mixing with oxygen-rich blood. The upper chambers, which receive blood, are called the right atrium and the left atrium. The lower chambers, which pump blood out of the heart, are called the right ventricle and the left ventricle.