Pulmonary arteries.
The aortic valve allows the blood to leave the left ventricle.
Ascending aorta
pulmonary arterie
Four main blood vessels enter/exit the heart: two veins and two arteries. Oxygenated blood enters the left ventricle through the pulmonary vein. This same blood is then pumped out of the left atrium via the aorta. Meanwhile, de-oxygenated blood enters the heart in the vena cava; before leaving through the pulmonary artery.
As blood leaves the left ventricle, it passes through the aortic valve an then into the aorta before being pumped throughout the rest of the body.
Because God made it that way
pulmonary trunk
the pulmonary vein
Thewall of the left ventricle is thicker than the wall of the right ventricle. This is because the left ventricle has to produce a larger force than the right ventricle. Blood from the right ventricle only has to go to the lungs, which are close to the heart. However blood from the left ventricle has to go all round the rest of the body, a much greater distance and so it meets more resistance from the blood vessels. For this reason the left ventricle has to generate a greater force to overcome the greater resistance, so it has more muscle, making its wall thicker. The volume of blood pumped out by each ventricle has to be the same.
Left artery
= Being larger than the right ventricle the left ventricle pumps more blood in each beat?" =