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.
During an action potential, hyperpolarization beyond (more negative to) the resting membrane potential is primarily due to __________. The large number of voltage-gated K+ channels opening during the repolarization phase quickly makes the membrane potential more negative as positively-charged K+ ions leave the cell.