Girls hearts usally beat slightly faster than males heart rate Normal heart rate is 60-100 BPM. For more information please contact me : http://wiki.answers.com/Q/How_heart_works&alreadyAsked=1
Tachycardia is an increased heart rate. This rate varies depending on age and sex.
because they need a change in heart rate.
Abnormally fast heart rate is Tachycardia.
Does the amplitude of the heart and heart rate always change together
very fast
yes.
they both have to do with a heart
It should mean fast movement. e.g. Bradykinesia is slow movement. Bradycardia is slow heart rate. Tachycardia is fast heart rate.
hyperthyroidism or thyroiditis can cause tachycardia, or rapid heart rate.
how fast something can change
yes, a steroid injection will cause a rapid heart-rate
yes it happen to me..standing heart rate is 120