Define these words:
germs
contagious
cold
flu
transfusion
fevers
brain.

GERMS: a microorganism, especially one which causes disease.
CONTAGIOUS: the communication of disease from one person to another by close contact.
COLD: a common viral infection in which the mucous membrane of the nose and throat becomes inflamed, typically causing running at the nose, sneezing, a sore throat, and other similar symptoms.
FLU: short for influenza.
TRANSFUSION: an act of transferring donated blood, blood products, or other fluid into the circulatory system of a person or animal.
FEVERS: an abnormally high body temperature, usually accompanied by shivering, headache, and in severe instances, delirium.
BRAIN: an organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating center of sensation and intellectual and nervous activity.

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.