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.

○ a

○ c

Explanation:

• Option A: A heart attack is a total interruption of blood flow (due to blocked artery), while heart failure is poor blood flow over time. So A is incorrect.
• Option B: Heart failure does not typically cause heart tissue death like a heart attack (which is due to blocked blood flow to heart muscle). So B is incorrect.
• Option C: A heart attack (myocardial infarction) occurs when blood flow to heart muscle is blocked, leading to heart tissue death. Heart failure is when the heart can't pump enough blood, leading to systemic oxygen deficiency (as organs don't get enough oxygenated blood). This is correct.
• Option D: Heart failure leads to insufficient oxygen to tissues, not excess toxic oxygen. So D is incorrect.

Answer:

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