Disease

Atherosclerosis – arteries are blocked by fat and cholesterol deposits, reducing blood flow.

Aneurysm – weakening of the blood vessel wall – may rupture.

Valve defects in the heart.
Varicose veins – Leaky venous valves – make veins become dilated and twisted in appearance – varicose veins (varic – swollen vein).

This is an image of the myocardium from a damaged heart.

Question: What do you think has happened?