The letter A is pointing to the _____. 
Definitions:
Chest Pain
A symptom that can be due to a number of health issues, ranging from indigestion to heart attack.
Bends Over
The action of leaning forward or curving the spine, typically to reach or pick something up.
Saphenous Vein
A large vein located in the leg and thigh, often used for grafts in coronary artery bypass surgery due to its length and size.
Major Vein
A large blood vessel that carries blood towards the heart from various parts of the body, essential for the circulatory system.
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