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.
Left ventricle Pumps oxygenated blood into the aorta via the tricuspid aortic valve; also forms the apex of the heart. Right ventricle Pumps deoxygenated blood into the pulmonary trunk via the pulmonary valve. To pump blood in and out of the chambers, doors are needed.