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2. Heart rate turbulence - Wikipedia

   en.wikipedia.org/wiki/Heart_rate_turbulence

   Heart rate turbulence (HRT) is a baroreflex-mediated adjustment of heart rate which acts as a counter-mechanism to premature ventricular contraction (PVC). [1] It consists of a brief speed-up in heart rate, followed by a slow decrease back to the baseline rate.

3. Tachycardia - Wikipedia

   en.wikipedia.org/wiki/Tachycardia

   Tachycardia, also called tachyarrhythmia, is a heart rate that exceeds the normal resting rate. [1] In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. [1] Heart rates above the resting rate may be normal (such as with exercise) or abnormal (such as with electrical problems within the heart).

4. Heart rate - Wikipedia

   en.wikipedia.org/wiki/Heart_rate

   A medical monitoring device displaying a normal human heart rate. Heart rate is the frequency of the heartbeat measured by the number of contractions of the heart per minute (beats per minute, or bpm). The heart rate varies according to the body's physical needs, including the need to absorb oxygen and excrete carbon dioxide.

5. Accelerator nerve - Wikipedia

   en.wikipedia.org/wiki/Accelerator_nerve

   The accelerator nerves increase the heart rate. They cause the heart to beat with more force, which then increases blood pressure. [2] While accelerator nerves increase the heart rate which then increases blood pressure, the accelerans nerve speeds it up by emitting noradrenaline. This results in an increased bloodflow. [3]

6. Accelerans nerve - Wikipedia

   en.wikipedia.org/wiki/Accelerans_nerve

   It is acted on by the nervous system, as well as hormones in the blood, and venous return: the amount of blood being returned to the heart. The two nerves acting on the heart are the vagus nerve, which slows heart rate down by emitting acetylcholine, and the accelerans nerve which speeds it up by emitting noradrenaline.

7. Cardiac conduction system - Wikipedia

   en.wikipedia.org/wiki/Cardiac_conduction_system

   A slow heart rate of 60 or less beats per minute is defined as bradycardia. A fast heart rate of more than 100 beats per minute is defined as tachycardia. An arrhythmia is defined as one that is not physiological such as the lowered heart rate that a trained athlete may naturally have developed; the resting heart rates may be less than 60 bpm.