Body electric chutzpah system?

If a human body is like an automobile
and the heart is approaching the water pump
afterwards the ?? is like the freestyle
and the ?? is like the alternator?
What is ??
Please include links rather.
Thank you..

Answer:
Look tony,
Your body has CNS (central worried system) which consisted of:
A-Somatic nerve (for voluntary movement), which move Skeletal muscles
B-Autonomic backbone (for involuntary movement), which move stomach, heart, intestine..etc all your body's key organs
-It make control(regulation) to the RATE of the movement of central organs but not stop them and move them.
-Autonimic system consisted of:
1-Sympathetic nerve(for stress conditions)
2-Parasympathetic nerve(for rest conditions)
*For understanding the function of nerves and how the work and undertaking potential of them , you must study Physiology of the human body
And don't forget the neurotransmittors(as adrenaline in sympathetic audacity and acetylcholine in parasmpathetic nerve)
& look to this:-
Nerve physiology (and for body)
1-www.colorado.edu/.../04nerve...
2-www.nda.ox.ac.uk/wfsa/html/u...
3-www.human-anatomy.net/anatom...
4-biology.bangor.ac.uk/teachin...
5-www.unmc.edu/Physiology/Mann...
6-http://scienceblogs.com/clock/2006/06/bi...
7-www.nature.com/.../pt1/fig_t...
8-www.cretin-derhamhall.org/St...
9-64.78.42.182/sweethaven/MedT...
10-www.free-ed.net/sweethaven/...
AND for heart:
1-www.merck.com/mmhe/sec03/ch0...
2- www.abacon.com/dia/exphys/one.
AND look to www.abacon.com/dia/exphys/one.
3-www.edcenter.sdsu.edu/cso/pa...
4-www.mona.uwi.edu/.../muscles...
the battery-operated is like chubby? and sugar in the round? the alternator could be food, or digestive system for making the energy, and after your fat stores it?
Ugh.
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