BEST Overview of the Human Heart!
The driving force behind the human circulatory system is the heart. The heart consists primarily of four chambers, through which the blood passes: The right atrium, the right ventricle, the left atrium, and the left ventricle.
Both ventricles are bordered by a pair of one-way valves that ensures that the blood only flows through them in one direction. Let’s take a look at the path of the blood flow as it goes through the heart.
Blood comes into the heart from the extremities and the organs through the inferior vena cava and the superior vena cava. Both of these empty out into the right atrium here.
Blood then flows from the right atrium into the right ventricle through the tricuspid valve, which is a one-way valve that ensures that the blood only passes that direction. It then is pumped out of the right ventricle into the pulmonary artery through another one-way valve, the pulmonary valve.
You’ll notice that the artery splits here to carry blood to each of the two lungs. The blood, which previously was deoxygenated, is now oxygenated and returns to the heart through the pulmonary veins. The pulmonary veins empty into the left atrium, here.
Blood then passes through the mitral valve, another one-way valve, into the left ventricle, where it is pumped through the aortic valve into the aorta. You’ll notice here we have an arch. This is known as the aortic arch. From the aorta, the blood is distributed into all of the major arteries, where it is carried to the extremities and the vital organs such as the brain.
Provided by: Mometrix Test Preparation
Last updated: 10/23/2018