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Hope you are fine.
In Oxford Advanced Learner's Dictionary, I found the following example:

"The function of the heart is to pump blood through the body."

Here is my question: Why is there "the" in front of "heart" and "body" but not "blood"?

I think the sentence should be "The function of the heart is to pump the blood through the body."

Do you agree?
Thank you so much

Dear David,

You would say "...the heart" because it is a major organ, just as you would say "...the pancreas; the liver; the brain."

Blood is a substance that moves through and/or sustains the major organs, similar to fat, cartilage, bile (bilirubin), etc. So, in the interest of "the major organs" being such, these nouns (the heart, the lungs, the bladder, etc.) are preceded by the article "the" as a sort of introduction and, to a lesser considered but implied "importance." That isn't to say that blood is less important than the heart; it's simply set up that way in the English language because blood "serves" the large, major organs.  

You wouldn't say "the blood" unless you were referring to it specifically, on its own, as a subject, like this: "The blood drawn from this patient is Type B"; however, if you turn that sentence around, you wouldn't use "the": "This patient's blood was drawn, and it is Type B."

Some of these answers aren't found in any book but are what Noam Chomsky, an astute linguist (, calls "deep grammar" -- the language that native speakers and writers know simply because "we know it" inherently. I wish I had a rule book for everything, but sometimes there just are just no references. I hope this helps!

All the best,
Catherine Van Herrin

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