Heart - Arteries - Arterioles - Capillaries - Venules - Vein - Heart
(Oxygenated blood from the arteries that branch off the aorta lose oxygen and gain carbon dioxide as they join with capillaries and turn into veins where the blood is deoxygenated and the blood returns to the right atrium of the heart via the inferior or superior vena cava as deoxygenated blood)
Capillaries - squamous epithelium (single layer of cells - ensures rapid diffusion and gas exchange of carbon dioxide and oxgen - exchange with cells - oxygen into cells)
How does blood move through the vessels?
Heart contracts (systole) - blood forced into arteries and elastic fibres allow them to stretch to accommodate the blood
Heart relaxes (diastole) - elastic fibres allow arteries to recoil, behind the blood, helping the push the blood foward towards the heart
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