21. Endothelial cells accomplish these feats by using depolarization to alter their structural strength. 22. Contraction of heart muscle cells requires depolarization and repolarization of their cell membranes. 23. It represents the smallest possible depolarization which can be induced in a muscle. 24. Normal Q waves, when present, represent depolarization of the interventricular septum. 25. The exact mechanism by which depolarization of horizontal cells hyperpolarizes photoreceptors is uncertain. 26. This change makes the activation gate open more easily by low voltage depolarization . 27. Both effects of cicutoxin on the GABAA-receptor cause a constant depolarization . 28. Depolarization of the membrane may also trigger these bursts.29. Calcium entry into the cell causes more prolonged depolarization and increased action potentials. 30. Opening of these channels result in cellular depolarization and blebbing causing cytotoxic edema.
