Final answer:
Ischemia is the medical term used to describe the restriction of oxygen-rich blood flow to the heart.
Step-by-step explanation:
The medical term used to describe restriction of the flow of oxygen-rich blood to the heart is Ischemia. Ischemia occurs when there is a blockage or narrowing of the coronary arteries, which supply blood to the heart muscle. This can lead to chest pain, also known as angina, and if the blood flow is completely cut off, it can cause a heart attack.
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