The correct answer is valve vegetations and stenosis.
Rheumatic heart disease (RHD) is damage to one or more heart valves that is caused by an episode/episodes of acute rheumatic fever. The normal blood flow through damaged valves is interrupted. The heart valves are unable to function properly, so the blood may flow backward through stretched valves (not closed properly), or may be blocked due to scarred valves (not opened properly). Heart surgery may be required for this condition.
Rusting has to do something with corrosion and involves oxygen.So basically, when oxygen is added to the system process, this what makes the metal can become heavier.
