Why should phospholipid non-polar tails be "protected" in the membrane bilayer?

Question

>lipids are arranged within the membrane with polar head towards the outer side and non polar tails towards inner side, this ensures that the non polar tail is protected from aqueous environment.My question is why should we protect non polar part ,will it destroy in contact with polar part? What should be the correct reason for bilayer arrangement?

Answer 1

The polar hydrophilic head (water loving) naturally gravitates to the aqueous environment. On the other hand, the non-polar (water fearing) tail, gravitates as far away from the aqueous environment as possible. The heads and tails self-arrange. Think of oil and water. No matter how much you shake/stir, they will never be combined in solution. The tail part of the phospholipid is made up of a saturated fat (straight) an unsaturated fat (kinked). Overall, this leads to the stability of the cell and allows materials to pass selectively.