Difference Between Left and Right Side of Heart

Left Heart vs Right Heart

The human heart is a muscular, four chambered heart consisting of two ventricles and two atria. It is about the size of fist, and is located posterior to the sternum and anterior to the vertebral column in the rib cage. The muscles of the heart are mainly made up of cardiac muscles of which the contraction is involuntary. The main function of the heart is to pump and to circulate blood through the body’s network of blood vessels, which supplies nutrition and oxygen to body cells, and removes waste products from the cells. Since, there are two cycle pumps present in humans ( pulmonary and systemic), the heart can be divided into two parts, namely; left side and right side, each of which contains one atrium and one ventricle. The muscular part between these two parts is referred to as ‘atrioventricular septum’.

Left Side of Heart

Left side of the human heart is composed of the left ventricle, left atrium, aortic valve and bicuspid mitral valves. This side receives oxygenated blood from the pulmonary veins and helps to pump it throughout the body cells and organs. To pump blood all over the body, heavy force is needed; hence the ventricle wall of the left side is thicker than the other side. Aorta and pulmonary veins are connected to the left side thought the left atrium.

Right Side of Heart

Right side of the human heart is composed of the right ventricle, right atrium, tricuspid valve, pulmonary valve, and SA and AV node. This side receives deoxygenated blood from body organs through superior and interior vena cava and returns to lungs through pulmonary artery. The concentration of CO2 and other wastes are higher in this blood, so it is called deoxygenated. The special types of tissues that help to generate nerve impulse can be found only in this side.

What is the difference between Left and Right Side of the Heart?

• Left side of the heart operates at a level up to 125 mmHg, whereas the right side of the heart operates at 25 mmHg.

• Right side drives a short, low pressure pulmonary circulation while the left side drives longer, high pressure systemic circuit.

• Wall of the left side of the heart is thicker than that of the right side.

• Right side circulates the deoxygenated blood while the left side circulates oxygenated blood.

• Right atrium receives blood from tissues and organs, and right ventricle pumps it to lungs. In contrast, left atrium receives blood from lungs and left ventricle pumps it to the rest of the body.

• Superior vena cava and inferior vena cava bring blood to right side of the heart while only pulmonary vein brings blood to left side.

• Blood in the right side of heart is pumped through the pulmonary artery, whereas blood in the left side is pumped through the aorta.

• Aortic and bicuspid mitral valves are present in the left side, whereas tricuspid valve and pulmonary semilunar valve are present in the right side.

• SA node (pacemaker) and AV node can be found only in the right side of the heart.