Back pain is proably not a heart attack.
Symptoms of a heart attack are chest pain usually radiating to the neck or left shoulder, shortness of breath, nausea, vomiting, palpitatins, sweating and anxiety.
The lower left chamber of the heart is called the left ventricle. It is thick and muscular hence manifests a stronger heart beat.
The lower the temperature the faster the heart beat which made us shiver.
A lower resting heart rate is an effect of exercise and as an athlete is more likely to exercise more regularly then their resting heart is likely to be lower.
Bring your lips in contact with cold water.
The heart would more than LIKELY not beat again (unable to make it beat again) and he or she will die.
For the most part, yes. Your bpm ([heart] beats per minute) is how your heart beat is usually measured. A resting heart rate lower than about 72 bpm is considered healthy. You can lower your bpm by exercising regularly. However, a heart beat of 0 bpm means your dead, which isn't healthy.
The heart beat can increase due to stress and exercise. There are many other factors that can increase heart rate.
How does an insects heart beat How does an insects heart beat How does an insects heart beat How does an insects heart beat
The first beat is to push the blood out and the second is to get the blood back into the heart.
The heart muscle actually beats on its' own. It has two pacemakers. One sets the pace and the second, slower one, is a back up. If you had one heart muscle cell (fiber) in a Petri dish it would beat. If you add a few more, they also will beat but not together. Only if they touch, then they will beat together.
The heart wouldn't beat at a constant rate.
A baby's heart beats faster than a child's or an adult's heart.