Phasic receptor. A phasic receptor is a sensory receptor that returns to its resting potential even though the stimulus is still applied. The process by which the magnitude of the generator potential decreases, even when the stimulus is maintained, is called adaptation. 1  Pacinian corpuscles. 2  Tonic receptor. 3  Phasic transmitter.
The normal resting adult heart beats regularly at an average rate of 60-100 times per minute. How fast the heart beats (heart rate) is governed by the speed of electrical signals originating from the pacemaker of the heart, the SA node.
Your heart rate is the number of times per minute that the heart beats. Heart rate rises significantly in response to adrenaline if a person is frightened or surprised. Taking a person's pulse is a direct measure of heart rate. A normal adult resting heart beat is between 60-100 heartbeats per minute. Some experienced athletes may see their resting heartrate fall below 60 beats per minute. Tachycardia refers to the heart beating too fast at rest - over 100 beats per minute. Bradycardia refers to the heart beating too slow - usually below 60 beats per minute. According to the American Heart Association, heart rate during exercise is around 220 minus the person's age.