Jerome also had blood work done to confirm the MI. The presence of troponin, or

Question

Jerome also had blood work done to confirm the MI. The presence of troponin, or cardiac enzymes such as CK-MB, are a positive indicator of an MI. Why is their presence at higher levels in the blood indicative of an MI?

a. They are by-products of aerobic metabolism and if they are present in higher amounts in the blood it shows that the myocardium is working harder. b. They are substrates for aerobic metabolism and if increased in the blood show that the cardiac muscle is not functioning normally. c. These proteins are normally found inside cardiac muscle cells and if present in the blood indicate damage to the cells. d. They are by-products of anaerobic metabolism (glycolysis) and if increased indicate that the heart is not receiving oxygen.

Explanation / Answer

ANS: C.These proteins are normally found inside cardiac muscle cells and if present in the blood indicate damage to the cells.

Explanation: Cardiac enzyme studies measure the levels of enzymes and proteins that are linked with injury of the heart muscle. These include the enzyme creatine kinase (CK), and the proteins troponin I (TnI) and troponin T (TnT).

Low levels of these enzymes and proteins are normally found in our blood, but if our heart muscle is injured, such as from a heart attack, the enzymes and proteins leak out of damaged heart muscle cells, and their levels in the bloodstream rise.

Related Questions

Navigate

• Browse (All)
• Browse J
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.