The heart is mainly made from ❌. The left ventricle of the heart has a ❌ muscle wall because it needs to pump blood further, and at a higher ❌, around the body. The right ventricle is under ❌ pressure as it only needs to pump blood to the ❌.
The heart needs a ❌ supply of oxygen and glucose for ❌. The ❌ artery is a branch of the aorta which transports ❌ to the heart muscle itself.
A ❌ in one of the branches of the coronary artery can severely interrupt blood flow and is called a ❌.
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heart attack
heart attack