Ion channels

Question 1

Structure of neuronal membranes

Answer 1

Lipid layer, 8-10nm thick
Good insulator (due to lipids) 
Good capacitor (due to thinness)
Impermeable to charged ions/ biologically active molecules
Multiple kinds of proteins embedded.

Question 2

Types of ion channel

Answer 2

1. Voltage gated
2. Ligand gated
3. Leak
4. Gap junctions
   All can be modulated by neurotransmitters