Correct option is B
Correct Answer:
Option (b) — Creatine kinase
Explanation:
Creatine kinase (CK), also known as creatine phosphokinase (CPK), is an enzyme found primarily in heart, skeletal muscle, and brain tissues.
When cardiac muscle cells are damaged (as in myocardial infarction), CK levels—particularly the CK-MB isoenzyme—increase in the blood.
Hence, measuring serum CK-MB activity is a standard diagnostic test for cardiac damage.
Information Booster:
-Creatine kinase (CK) Isoenzymes:
-CK-MM: Found in skeletal muscle
-CK-BB: Found in brain
-CK-MB: Found in cardiac muscle (marker for myocardial infarction)
Other cardiac markers:
-Troponin I and T – most specific and sensitive indicators
-Lactate dehydrogenase (LDH-1) – older, secondary marker
Additional Knowledge (Incorrect Options Explained):
(a) Creatine: A metabolite, not a marker of cardiac injury.
(c) Peroxidase: An enzyme in various cells; not cardiac-specific.
(d) Urea: Reflects kidney function, not cardiac damage.
