The x-ray recording of a blood vessel after the injection of a radiopaque substance is:

A) electrophysiology.
B) stress test.
C) angiography.
D) cardiac enzymes.

Radiopaque Substance

A material that does not allow X-rays or similar radiation to pass through, making it visible on radiographic images.

Angiography

A medical imaging technique used to visualize the inside of blood vessels and organs of the body, with particular interest in the arteries, veins, and the heart chambers.

X-ray

a form of electromagnetic radiation used in medical imaging to generate images of structures within the body, particularly bones.