Sunrise and sunset time for Punta Cana. Punta Cana weather. Punta Cana, Dominican Republic: basic facts and figures. The length of a solar day is determined by the time that it takes for the Earth to complete a full rotation around its axis and equals 24 hours. The Earthâs rotation on its axis leads to change between day and night.
The region of positive charge causes nearby voltage gated sodium channels to close. Just after the sodium channels close, the potassium channels open wide, and potassium exits the axon, so the charge across the membrane is brought back to its resting potential. This is called repolarisation.
Â· just now. Report Abuse. Sodium (Na) and potassium (K) are the ions primarily involved in establishing the membrane potential. The cell expends energy (ATP) to run a pump known as the Na/K ATPase to move sodium out of the cell and potassium into it. Source(s): http://en.wikipedia.org/wiki/Na%2B/K%2B-... kt Â· 7 years ago.