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In this patient, the right coronary artery (RCA) is filled with contrast agent. By a natural bypass, that is, the collateral channel (arrows), the left coronary artery (LAD), which is blocked at its origin (ring), is filled with blood.
wikiHow to Unclog Arteries Naturally. Arteries â the larger blood vessels that carry blood from the heart throughout the body â can clog with plaques consisting of fat, cholesterol, and other substances. These plaques can grow, narrowing arteries over time. The result is a condition called atherosclerosis, which means hardening of the arteries.