Normally the nervous system utilize about of the glucose consumed each day

ANSWER:

The nervous system which includes the brain makes use of almost half the glucose produced in the body. Glucose is a major source of energy for the body.

EXPLANATION:

The brain specially is dependent on sugar for its functioning. The main functions of the brain like thinking, memory and learning all need sugar and glucose. The brain is rich in nerve cells and therefore needs sugar to activate its neurotransmitters. If the sugar or glucose level is low in the body, the neurotransmitters of the brain do not work in a normal manner.  

Ican only answer your first question, a machine is like a human body because it's a little similar. they both almost work like the same.

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