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.
C
Explanation: A) Electrophysiology maps the electrical condition within the heart.
B) A stress test uses a treadmill while recording an ECG.
C) Correct.
D) Cardiac enzymes are blood tests that are performed to determine heart damage.
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