You must be at least 17 years old to donate to the general blood supply, or 16 years old with parental/guardian consent, if allowed by state law. Learn more about the reasons for a lower age limit.
Other Causes of Elevated Heart Rate. Elevated heart rate when sick is actually your heartâs aid in order to quell the sickness. However, there can be other causes for elevated heart rate as well. Electrical signals produced and sent to the heart tissues are responsible for controlling the heart rate.
How fast is a dangerous heart beat. http://www.chacha.com/question/how-fast-is-a-dangerous-heart-beat. An arrhythmia is a change in the rhythm of your heartbeat.When the heart beats too fast, it's called tachycardia.ealth related question in topics Heart Beat .We found some answers as below for this question How fast is a dangerous heart beat,you can compare them. A: An arrhythmia is a change in the rhythm of your heartbeat.