👉 A peristyle is a type of organ that is involved in the regulation of blood flow and oxygenation in the cardiovascular system. It consists of two chambers, the pulmonary artery (arteria pulmonale) and the pulmonary vein (arteria venulele), which are connected by a valve called the pulmonary valve. The pulmonary valve allows for the exchange of gases between the lungs and the bloodstream, while preventing the blood from flowing back into the lungs. The peristyle is responsible for regulating
