There are several different health benefits of bananas that the average person is not aware of. Bananas are actually extremely good for your heart and your nerves. A single banana contains an astounding 400mg of potassium. Potassium is one of the most important nutrients when it comes to keeping your heart and nervous system healthy. Potassium plays an extremely large role in muscle contraction which is required for the pumping of the heart, food digestion, and athletic activities.