Crossword Clue:

the vital part

Answer	Crossword Clue
HEART	Vital part.
JUGULAR	Vital part
PITH	Vital part

ESSENCE	Vital part.
SOUL	Vital part
AXLE	Vital auto part.
ORING	Vital space-shuttle part
COG	Minor yet vital part
AORTA	Vital part of systemic circulation
TIRE	Vital part of a jeep.
GIST	Most vital part of some idea