Abnormal retraction of the vessel walls, which causes blood to stop flowing into the evacuated tube, is demonstrated in

Question

Quizplus · Accepted Answer

The collapse of a vein is the correct answer because it refers to the abnormal retraction of the vessel walls, which can occur when the vacuum pressure of the blood collection tube is too strong for the vein, causing it to collapse and stop the flow of blood into the tube.

Abnormal Retraction of the Vessel Walls, Which Causes Blood to Stop