What are the pathways of blood?

Systemic circulation: This is the main pathway that blood takes as it is pumped by the heart to the rest of the body and back. Oxygen-rich blood is pumped from the heart through the aorta, which is the main artery in the body. The aorta branches off into smaller arteries that deliver blood to all of the tissues in the body. Once the blood has delivered its oxygen to the tissues, it returns to the heart through the veins. The inferior vena cava collects blood from the lower body, while the superior vena cava collects blood from the upper body. The blood then returns to the heart.

Pulmonary circulation: This pathway is responsible for transporting blood between the heart and the lungs. Oxygen-poor blood is pumped from the heart through the pulmonary artery to the lungs. In the lungs, the blood picks up oxygen and releases carbon dioxide. The blood then returns to the heart through the pulmonary veins.

Coronary circulation: This is the pathway of blood that supplies the heart muscle with oxygen-rich blood. The coronary arteries branch off from the aorta and deliver blood to the heart muscle. The veins that return blood from the heart muscle drain into the coronary sinus, which is a chamber in the heart.

Hepatic portal circulation: This pathway of blood travels between the intestines and the liver. After you eat, blood carrying nutrients from your meal is transported to the liver via the hepatic portal vein. Once the nutrients have been processed, the blood is sent to the rest of your body.

Renal circulation: This is the pathway of blood between the kidneys and the heart. The kidneys filter out waste products from the blood and produce urine. The filtered blood is then returned to the heart.

Cerebral circulation: This is the pathway of blood between the brain and the heart. The brain requires a constant supply of oxygen-rich blood in order to function properly. The blood that supplies the brain comes from the carotid artery and the vertebral arteries.