An emergency room physician has withdrawn blood from a vessel in your arm. The dark red color of the blood indicates that it was

Name: An emergency room physician has withdrawn blood from a vessel in your arm. The dark red color of the blood indicates that it was
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The dark red color of the blood indicates it is deoxygenated, which is characteristic of venous blood. Blood in veins is typically darker than arterial blood, which is bright red due to higher oxygen content.

An Emergency Room Physician Has Withdrawn Blood from a Vessel