Question

what distinguishes a heart attack from heart failure.
a. a heart attack results from poor blood flow, while heart failure involves a total interruption of
blood flow.
b. both heart attack and heart failure result in heart tissue death, but more tissue dies as
a result of heart failure.
c. heart tissue dies during a heart attack, while heart failure results in systemic oxygen
deficiency.
d. heart failure results in body tissues receiving such a high level of oxygen that it is
toxic.

please select the best answer from the choices provided.

Explanation:

• Option A: A heart attack is due to a total (or near - total) interruption of blood flow (e.g., from a blocked coronary artery), while heart failure is when the heart can't pump enough blood, not a total blood flow interruption. So A is incorrect.
• Option B: Heart failure does not typically result in heart tissue death in the same way a heart attack (myocardial infarction) does. A heart attack causes heart tissue death (myocardial necrosis), but heart failure is a chronic or acute condition of impaired pumping, not primarily tissue death. So B is incorrect.
• Option C: During a heart attack (myocardial infarction), the lack of blood flow (due to blocked artery) causes heart tissue (myocardium) to die. In heart failure, the heart can't pump enough blood to meet the body's needs, leading to systemic oxygen deficiency as organs and tissues don't get enough oxygen - rich blood. This is correct.
• Option D: Heart failure leads to insufficient oxygen delivery to tissues, not excessive oxygen that is toxic. So D is incorrect.

Answer:

C. Heart tissue dies during a heart attack, while heart failure results in systemic oxygen deficiency.