The heart's main function is to pump blood, which carries oxygen and nutrients to the body's cells and removes waste products.

The human heart has four chambers: two atria (upper chambers) and two ventricles (lower chambers).

The mitral valve, also known as the bicuspid valve, separates the left atrium from the left ventricle.

The sinoatrial node (SA node) is the natural pacemaker of the heart. It generates electrical impulses that spread through the heart, causing it to contract and pump blood.

The coronary arteries supply oxygen-rich blood to the heart muscle, allowing it to contract and pump blood effectively.

Coronary artery disease (CAD) is the most common type of heart disease. It occurs when the coronary arteries become narrowed or blocked, reducing blood flow to the heart muscle.

Heart attack, also known as myocardial infarction, is the leading cause of death from heart disease. It occurs when blood flow to a part of the heart is blocked, causing damage to the heart muscle.

All of the above statements are true. A heart attack affects the heart, while a stroke affects the brain. A heart attack is caused by a blockage in the coronary arteries, while a stroke is caused by a blockage in the arteries supplying blood to the brain. A heart attack can lead to sudden death, while a stroke can lead to paralysis or other long-term disabilities.

All of the listed factors are risk factors for heart disease. High blood pressure, high cholesterol, diabetes, smoking, obesity, physical inactivity, and family history of heart disease can all increase the risk of developing heart disease.

All of the listed symptoms can be associated with a heart attack. Chest pain or discomfort is the most common symptom, but it's important to note that not all heart attacks cause chest pain.

If you think you are having a heart attack, the most important thing to do is call 911 immediately. Aspirin can help reduce the risk of blood clots, but it should not be taken before calling 911.

The treatment for a heart attack depends on the severity of the attack and the underlying cause. Treatment options may include angioplasty and stenting, bypass surgery, medication, and lifestyle changes.

All of the listed lifestyle changes can help prevent heart disease. Eating a healthy diet, getting regular exercise, maintaining a healthy weight, quitting smoking, and managing stress can all reduce the risk of developing heart disease.

The recommended amount of physical activity for adults to prevent heart disease is at least 150 minutes of moderate-intensity aerobic activity or 75 minutes of vigorous-intensity aerobic activity per week.

The recommended daily intake of fruits and vegetables to prevent heart disease is at least 5 servings.