Help with all 11 What is a selectivity filter 12 What is a g

Help with all!

11) What is a selectivity filter?

12) What is a gating mechanism?

13) How is it possible for K+ channels to conduct K+ over Na+?

14) What is the difference between active and passive transport?

15) What differentiates the types of active transport?

Solution

11) Selectivity filter is a constricted portion of the conducting pathway which helps in determining the cation, either Na+ or K+ passing through a channel.

12) In a gating mechanism there is an increased duration of the action potential from the AV node to the point in the purkinje system which helps in regulating the opening and closing of cell membrane ion channels.

13) The most important reason for K+ channels to conduct K+ over Na+ is the fact that almost 100 different types of K+ channels are encoded by Human DNA.

14) Active transport refers to the movement of solutes across the menmbarne against concentration gradient using energy in the form of ATP whereas Passive transport refers to the movement of solutes along the concentration gradient which does not require any energy.

15) Its in the type of materials that is being transported in or out in the form of ions or large particles and also whether the particles are outgoing or incoming. There are 3 types of active transport- Na-K pump, endocytosis, and exocytosis.