The term 'Chief Artery' refers to the two main arteries in the human body: the AORTA and the mainline. The AORTA is the largest artery in the body, originating from the left ventricle of the heart and extending down to the abdomen, where it splits into two smaller arteries. The mainline is the second largest artery in the body, originating from the right ventricle of the heart and extending up to the head and neck. Together, these two arteries are responsible for supplying oxygenated blood to the entire body.