WAVE OF EXCITATION: A COMPREHENSIVE REVIEW IN CARDIAC PHYSIOLOGY The concept of the wave of excitation forms the fundamental basis of cardiac function, representing the precisely orchestrated electrical impulse that initiates mechanical contraction, or systole, in the heart. This phenomenon is critical for understanding how the heart acts as an efficient, synchronized pump. The impulse […]
Beta-Adrenergic Receptor Kinase (BARK) is a critical enzyme in the regulation of beta-adrenergic receptor (beta-AR) signaling and receptor desensitization. It is a member of the AGC kinase family that includes protein kinase A (PKA), protein kinase C (PKC) and others. BARK is responsible for phosphorylating the carboxyl tail of beta-ARs, resulting in desensitization of the […]
The Cardiac Refractory Phase Introduction to the Cardiac Refractory Phase The refractory phase is a fundamental physiological phenomenon within the cardiac cycle, representing a period during which the heart muscle, or myocardium, is temporarily unresponsive to further electrical stimulation. This critical period ensures the heart’s coordinated and efficient pumping action, preventing chaotic electrical activity that […]