There are two variables that set ion selectivity 1

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: tage ­gated K+ channels and the inactivation of the Na+ channels. K+ ions flow out of the cell cause the membrane potential to fall original resting membrane potential. The hyperpolarization of the membrane causes the Na+ channels to switch from an inactivated to the closed state. 6. How do sodium and potassium channels in the membrane differentiate between what ion to can pass through the channel (ion selectivity)? This was not covered in lecture. There are two variables that set ion selectivity. 1. Size: K+ ions are larger than Na+ ions. The Sodium channel contains a selectivity filter that does not allow the larger K+ ions to move through the channel. 2. Hydration shells: Water is requ...
View Full Document

This note was uploaded on 04/23/2012 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell University (Engineering School).

Ask a homework question - tutors are online