Blood circulates continuously in blood vessels in the body. Blood circulating in the body is mainly divided into two parts. Pulmonary circulation started from the right ventricle and blood goes to the lungs and from there returns to the left atrium, so the circulation from the right ventricle to the left atrium is called pulmonary circulation. In the pulmonary circulation, deoxygenated blood in the right ventricle exits the right ventricle