Bundle of nerves that extends from the brain down the back:

Producing an image, by beaming magnetic waves at the heart:

Radioactive pharmaceutical (“tagged” chemical) is injected intravenously to show flow of blood to heart muscle:

Visual examination of the large intestine:

Producing images of the heart using sound waves:

Measurement of blood flow in vessels via sound waves:

Introducing a flexible tubular instrument into a blood vessel to measure pressure and patterns of blood flow in coronary arteries and the heart:

Measurement of substances in the blood after a heart attack:

The largest artery in the body; receives blood from the left ventricle of the heart:

Recording of the electricity flowing through the heart: