The origins of the Mass Rapid Transit (MRT) are derived from a forecast by city planners in 1967 which stated the need for a rail-based urban transport system by 1992.he lines are built by the Land Transport Authority, a statutory board of the Government of Singapore, which allocates operating concessions to the profit-based corporations, SMRT Corporation and SBS Transit. These operators also run bus and taxi services, thus facilitating full integration of public transport services.
A silent heart attack is a heart attack that happens without causing noticeable symptomsâor at least, without causing symptoms so severe that the victim cannot ignore them. Most of us tend to think about a myocardial infarction (heart attack) as a pretty dramatic eventâand most of the time, it is.
As a large, muscular pump, the heart relies on a constant supply of oxygen-rich blood to function. Without a blood supply, heart muscle begins to die. This is exactly what happens during a heart attack. Myocardial infarction, the medical term for heart attack, literally means heart tissue damage or death.. Heart attacks most commonly occur when one or more of the coronary arteries â a network of blood vessels that supply blood to the heart â become blocked. Heart muscle becomes starved for oxygen and nutrients.