Final answer:
The term 'ischemia' describes myocardial cells that are temporarily deprived of a blood supply, which can eventually lead to a myocardial infarction (heart attack) if not corrected.
Step-by-step explanation:
The myocardial cells temporarily deprived of blood supply are described by the term ischemia. Ischemia occurs when there is reduced blood flow to the tissue region downstream of a narrowed vessel, which can cause hypoxia - a decreased supply of oxygen to the tissues. This can be particularly dangerous when it involves cardiac muscle, as it can lead to cell death and severe impairment of heart function. The most severe form of ischemia in the heart can result in a myocardial infarction (MI), or heart attack, which is caused by complete blockage of a coronary artery leading to the death of myocardial cells.