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°DIFFERENT BLOOD VESSELS° ARTERIES
(function): Carry blood away from the heart ( always oxeygnated apart from the pulmonary artery which goes from the heart to the lungs ).
(STRUCTURE): They have thick muscular walls. And have small passageways ( another word for lumen) for blood .
(BLOOD PRESSURE): Contains blood under hight pressure.
————————————————————————————————————— VEINS
( function) : Carries blood towards the heart ( always deoxygenated apart from the pulmonary vein which goes from the lungs to the heart ).
(structure ): Has thin walls. Has larger passageways (lumens) for blood. Has valves to prevent blood from flowing backwards.
(blood pressure): Contains blood under low pressure.
————————————————————————————————————— CAPILLARIES
(function):Found in the muscles and lungs. Where gas exchange takes place - oxygen (O²) passes through the capillary wall and into the tissues, while carbon dioxide ( CO²) passes from the tissues into the blood.
(structure): Microscopic - one cell thick.
(blood pressure): Very low blood pressure.
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