write short notes on physics of heartbeat.
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Known affectionately as the "heartbeat" state because of the resemblance of its X-ray light curve to an electrocardiogram, the ρ state (see Figure 1) is a ~50 s oscillation consisting of a slow rise followed by a series of short bright bursts with amplitudes of order 5 × 1038 erg s−1 and strong changes in the X-ray
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Alternative Title: heart beat
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contraction of cardiac muscle
…of the heart, or the heartbeat, is caused by alternating contractions and relaxations of the myocardium. These contractions are stimulated by electrical impulses from a natural pacemaker, the sinoatrial, or S-A, node located in the muscle of the right atrium. An impulse from the S-A node causes the two atria…
The rhythmic contraction of cardiac muscle is regulated by the sinoatrial node of the heart, which serves as the heart’s pacemaker.
vertebrate heart is myogenic (rhythmic contractions are an intrinsic property of the cardiac muscle cells themselves). Pulse rate varies widely in different vertebrates, but it is generally higher in small animals, at least in birds and mammals. Each chamber of the heart has its own contraction rate. In the frog,…
an audible sound, called the heartbeat. The first sound occurs when the mitral and tricuspid valves close, the second when the pulmonary and aortic semilunar valves close. These characteristic heart sounds have been found to be caused by the vibration of the walls of the heart and major vessels around…