What is heart attack ? List atleast two possible causes of heart attack .

Explanation

### Step-by-Step Solution:

1. **Definition of Heart Attack**: A heart attack, also known as a myocardial infarction, occurs when blood flow to a part of the heart is blocked. This blockage is often due to the formation of a clot in the coronary arteries, which supply blood to the heart muscle.

2. **Effects of Blood Flow Blockage**: When the blood flow is inhibited, the heart muscle does not receive enough oxygen. This lack of oxygen can cause damage to the heart tissue, leading to serious complications or even death if not treated promptly.

3. **Causes of Heart Attack**:
- **High Cholesterol Levels**: Elevated levels of cholesterol in the blood can lead to the buildup of plaques in the coronary arteries. This buildup narrows the arteries and can eventually lead to the formation of a clot.
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