Stents are metallic cages that hold open a coronary artery after angioplasty. Metallic objects placed in the body can pose problems for MRI scans, which use a strong magnetic field and pulses of radio waves to see inside the body. The magnetic field could dislodge the object, while radio waves could make it heat up.
The Cardiovascular System: The Heart. I. Introduction. A. The major function of the cardiovascular system is to circulate substances throughout. the body. In other words, its organs function to supply cells and tissues with oxygen. and nutrients and also to remove wastes, CO. 2. and urea, from cells and tissues.
The functions of the heart are to pump oxygenated blood around the body, and to deliver deoxygenated blood and waste products (carbon dioxide) to the lungs. The heart consists of four chambers, each separated by valves that only permit blood to flow in one direction.