Coronary artery occlusion reduces oxygen supply to heart muscle when atherosclerotic plaques, thrombosis or cholesterol-related narrowing restrict coronary blood flow.
Coverage 2018–2018 · Updated 15 Jul 2026
Coronary artery occlusion interrupts oxygen delivery to cardiac muscle and can cause myocardial infarction: irreversible death of part of the heart muscle.
Endothelial damage can allow lipid-rich atheroma to develop beneath the artery lining. A plaque narrows the lumen, and rupture can activate platelets and fibrin formation, producing a thrombus that partly or completely blocks flow.
Reduced coronary flow causes ischaemia: aerobic ATP production falls while cardiac muscle continues to demand energy. Prolonged complete occlusion damages and kills the supplied tissue, impairing contraction.
Epidemiological data may show a positive correlation between a proposed risk factor and coronary disease. A correlation coefficient quantifies direction and strength, but confounding variables and study design must be considered.
Even a strong correlation does not by itself prove that one variable causes coronary occlusion. Distinguish gradual plaque narrowing from an acute thrombus after plaque rupture.
This objective is assessed through structured response, commonly using Outline.
Outline
Build the answer around this relationship: Coronary arteries supply oxygen to cardiac muscle.
Treating cholesterol correlation data as proof of direct causation.
Representative question
Outline the causes and consequences of blood clot formation in coronary arteries.
Animal and plant transport answers should link structure to function. In animals, capillaries exchange, arteries maintain high-pressure flow, veins return low-pressure blood, pulse measures arterial pressure waves, and coronary occlusion blocks oxygen delivery to heart muscle. In plants, xylem transports water by transpiration tension and cohesion, while stem and root tissue plans show where xylem and phloem are arranged.
