If you are keen for your baby to be introduced to swimming before he is six weeks old your partner, or someone else, can take him. Some private baby swim classes start as early as four weeks but most classes at public pools begin at around 4 months.
Electrocardiogram (EKG, ECG) General Description. As the heart undergoes depolarization and repolarization, the electrical currents that are generated spread not only within the heart, but also throughout the body. This electrical activity generated by the heart can be measured by an array of electrodes placed on the body surface.
rapid depolarization - The change in membrane voltage potential which quickly triggers the action potential and contraction of cardiac muscle cells; the change is due to the opening of voltage-gated fast Na+ channels which allow Na+ ions to enter the cytoplasm causing the resting potential of -90 mV to change to +25 mV in the cell interior.