Yes, risk of electric shock is increased with bitten nails. This is because nails, which do not conduct electricity, would have shielded the finger from contacting the naked wire. Also, bitten nails are sometimes wet with saliva, further increasing the risk.
he is homesick, and stressed
relive stress of being homesick
Ralph has bitten his fingernails, because he is a nervous person. It is to help him cope with stress and his nervousness.
severely bitten nails
Nails (and finger nails) have volume.
Finger nails are made of a protein called keratin.
No one invented finger nails.
Actually, finger nails contain protein (called "keratin").
By system, you mean category.. I'm not sure if you mean finger nails or like tool nails, so I'll give you both. Finger nails: Body parts Tool nails: Hardware
Yes. During "The Return of the King". It was bitten off by Gollum.
Finger nails (and toe nails) are made of keratin.