The Hemoglobin in the cell joins with oxygen molecules in our lungs and transports this "breath of life" (spirit) to every one of the six trillion cells in the human body.
Oxygen = Spirit
If there is to be a vote on why people don't take you seriously, I want this to be entered into nomination.
People, by the way, are just chock full of things that a functionally important without being alive. Boogers come to mind. But that's because booger are funny.
Genesis 2
17 But of the ponderosa pine, thou shalt not eat of it; for in the day that thou shinniest thereof thou shalt sorely learn of thy nakedness.
18 And we all live happily ever after.