What exactly happens when the heart is deprived of blood?

What exactly happens when the heart is deprived of blood?

If some blood still flows, the patient has chest pain and discomfort. This condition is called Unstable Angina. If the blood supply is totally stopped, the part of the heart, not served by blood supply owing to the blockages ‘dies’, that is, the heart tissue temporarily loses life and becomes nonfunctional. This is known as Heart Attack.
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