The function of pulmonary circulation is to exchange carbon dioxide for oxygen in the blood. It is the passage of blood from the heart to the capillaries of the lungs, where the gases are exchanged, and back to the heart... More »

Systemic circulation refers to the path blood takes on its route around the body as it brings oxygen to the tissues, while pulmonary circulation is the smaller loop blood takes to the lungs. Each loop runs through a diff... More »

According to the American Heart Association, fetal circulation does not include pulmonary circulation because the fetus is unable to breathe oxygen in the womb. Instead, the mother's placenta oxygenates the blood for the... More »

Haemoglobin, also spelled hemoglobin, is part of the red blood cells and its main function is to transport oxygen from the lungs to the tissues, then transport carbon dioxide back to the lungs from the tissue. Each red b... More » Science Human Anatomy Blood

Blood that reaches the lungs travels throughout a network of small blood vessels, where oxygen moves into the blood and carbon dioxide moves out of the blood, according to the National Heart, Lung and Blood Institute. Th... More »

Red blood cells have no nucleus, because most of their bulk is made up of hemoglobin, a compound that carries gases, such as oxygen and carbon dioxide. In fact, about a third of a red blood cell is dedicated to hemoglobi... More »

Pulmonary function tests, or PFTs, typically include a spirometry reading, which tests how much air the patient can breathe in and out and how well the lungs transfer oxygen and carbon dioxide in and out of the bloodstre... More » Health Diagnostics & Imaging