All Valves Closed. This phase of the cardiac cycle begins with the appearance of the QRS complex of the ECG, which represents ventricular depolarization. This triggers excitation-contraction coupling, myocyte contraction and a rapid increase in intraventricular pressure. Early in this phase, the rate of pressure development becomes maximal.
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Dermal piercing, also known as microdermal piercing, is a form of body piercing where the dermis, i.e., the layer of skin underneath the epidermis, the outer layer of skin, is punctured or cut in order to place body jewelry. Dermal piercings can be made on almost all skin surfaces of the body.