The blood in the arteries is of a more florid colour than that in the veins.
Blood circulation
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"All we know is still infinitely less than all that still remains unknown."
Philosophical"Nature does nothing in vain."
Strange & Unusual"The more accurately we observe, the more clearly we understand."
Strange & Unusual"There is no perfect knowledge which can be entitled ours, that is innate; none but what has been obtained from experience, or derived in some way from our senses."
Controversial"There is no science which does not spring from pre-existing knowledge, and no certain and definite idea which has not derived its origin from the senses."
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