Yes!
because they need a change in heart rate.
Does the amplitude of the heart and heart rate always change together
Yes, your heart rate will change your energy levels in many different ways. If you are working out you will have a higher heart rate and this will cause you to be tired after you work out.
To calculate percent heart rate change, first determine the initial heart rate (HR_initial) and the final heart rate (HR_final). Use the formula: ((HR_{final} - HR_{initial}) / HR_{initial} \times 100). This will give you the percentage change in heart rate from the initial value to the final value. For example, if your initial heart rate is 70 bpm and your final heart rate is 80 bpm, the percent change would be ((80 - 70) / 70 \times 100 = 14.29%).
It is a rate of change that is not the same at all points - in time or space.
It will lower the heart rate.
exercise
Because your heart needs to burn energy, the more energy you burn the faster your heart rate
Chronotropy refers to the heart's ability to change its heart rate. Positive chronotropy increases heart rate, while negative chronotropy decreases heart rate. This is controlled by the autonomic nervous system and various hormones.
Normally being fit strengthens your heart and slows down your heart when you rest.
There are a great number of chemicals that can speed up or slow down the heart rate, as well as chemicals that can change the rhythm of your heart.
Yes, but this and every other stimulant increases your heart rate.