Detail of the artery. Note the folds on the inner wall that allow the diameter to increase when the surrounding muscles are contracted.
Detail of the vein.
Artery and vein
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Artery and vein
Detail of the artery. Note the folds on the inner wall that allow the diameter to increase when the surrounding muscles are contracted.
Detail of the vein.
Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA