Question

Why is myoglobin and creatine kinase (CPK) not specific to cardiac muscle?

A) They are not released into the bloodstream during myocardial injury
B) They are present in skeletal muscle as well
C) They are not enzymes
D) They are only present in brain tissue

Answer 1

Myoglobin and creatine kinase (CPK) are not specific to cardiac muscle because they are also present in skeletal muscle and are enzymes present in different tissues.

Step-by-step explanation:

Myoglobin and creatine kinase (CPK) are not specific to cardiac muscle because:

1. They are not released into the bloodstream during myocardial injury.
2. They are present in skeletal muscle as well.
3. They are enzymes present in different tissues such as the cardiac muscle, skeletal muscle, and brain tissue.

Myoglobin is responsible for storing and transporting oxygen in muscle cells, while CPK is an enzyme involved in energy production in muscles. Both can be found in other muscle tissues besides the heart.