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.
If the check-engine light comes on, here are some tips on what you should do: 1  Look for a serious problem that requires immediate attention. 2  Try tightening your gas cap. 3  Reduce speed and load. 4  Contact OnStar, if available. 5  Have the code read and the problem fixed. 6  Don't go for a state emissions test.