Also known as John Wayne Airport, SNA is the only commercial service airport in Orange County, California. It is about 35 miles south of Los Angeles, between the cities of Costa Mesa, Irvine, and Newport Beach, and is 14 miles from Disneyland.
potassium channel a voltage-gated protein channel selective for the passage of potassium ions. protein channel a watery pathway through the interstices of a protein molecule by which ions and small molecules can cross a membrane into or out of a cell by diffusion.
Phase 2:known as plateau phase, the membrane remains in a depolarized state. potassium channels stay close, calcium channels stay open. Phase 3: the internal potential gradually falls to more negative. A subtype of potassium channels open, allow signigicant amount of potassium flow out of the cell.