Examlex
The discovery of ____ and iron enabled the development of more sophisticated tools.
Heartbeat
The rhythmic contraction and relaxation of the heart, pumping blood throughout the body.
Angina Pectoris
A condition characterized by chest pain due to reduced blood flow to the heart muscle.
Blood Supply
The provision of blood to a particular area or organ of the body, essential for delivering nutrients and oxygen.
Arteries
Blood vessels that carry oxygenated blood away from the heart to the body's organs and tissues.
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