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General diagram of a portal venous system, for example, this occurs in the hypophyseal portal system between the hypothalamus and the anterior pituitary gland.. In the circulatory system of vertebrates, a portal venous system occurs when a capillary bed pools into another capillary bed through veins, without first going through the heart.
Diagram showing venous blood flow from capillary beds in some specific locations including the lungs, liver, and kidneys. There are some separate parallel systemic circulatory routes that supply specific regions, and organs. [8] They include the coronary circulation, the cerebral circulation, the bronchial circulation, and the renal circulation.
With each of the newborn's breaths, blood perfuses the pulmonary capillary beds and undergoes oxygenation before exiting the lungs via the pulmonary veins and returning to the heart. Thus, as more blood flows through the pulmonary circulation, there will be a higher volume of blood returning to the left atrium from the lungs.
Capillary bed Diagram of capillary network joining the arterial system with the venous system The systemic circulation is a circuit loop that delivers oxygenated blood from the left heart to the rest of the body through the aorta .
This allows blood flow to increase while resistance decreases. [citation needed] Extreme exercise can make capillaries vulnerable, with a breaking point similar to that of collagen. [23] Capillary permeability can be increased by the release of certain cytokines, anaphylatoxins, or other mediators (such as leukotrienes, prostaglandins ...
Approximately 75% of total liver blood flow is through the portal vein, with the remainder coming from the hepatic artery proper. The blood leaves the liver to the heart in the hepatic veins. The portal vein is not a true vein, because it conducts blood to capillary beds in the liver and not directly to
[1] [2] The peripheral arteries supply oxygenated blood to the body, and the peripheral veins lead deoxygenated blood from the capillaries in the extremities back to the heart. [3] Peripheral veins are the most common intravenous access method in both hospitals and paramedic services for a peripheral intravenous (IV) line for intravenous ...
Diagram of the circulation related to a single glomerulus, associated tubule, and collecting system The renal corpuscle in the cortex (outer layer) of the kidney. At the top, the renal corpuscle containing the glomerulus. The filtered blood exits into the renal tubule as filtrate, at right. At left, blood flows from the afferent arteriole (red ...