The coronary arteries regulate the supply of blood to your heart muscle depending on how much oxygen your heart needs at the time, as indicated by: 1  The number of times your heart beats per minute (heart rate). 2  Your blood pressure. 3  The force of your heart's contractions.  The thickness of your heart muscle.
When your car's Check Engine light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap.
Most cars have one or two brake warning lights on the dashboard. When you first start your car, all of the lights on the dashboard should light up. This is the bulb check; they should go out in a few seconds. If a light doesn't go out, then your car is alerting you of a problem. If a light does not light during the bulb check, it tells you that you need to replace the bulb. Your car illuminates the BRAKE lightÂ­ to indicate one of two things: 1  that your emergency brake is on. 2  Release it to solve the problem. 3  that you have lost brake pressure in half of the brake system (see How a Combination Valve Works for details).