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T o F: You invert the tube 15 times after venipuncture.

User Jkdba
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Final answer:

During the hour that the blood sample is in the glass tube, it undergoes changes such as clotting and forming serum.

Step-by-step explanation:

In the context of this question, the subject is Biology. When a blood sample is collected in a glass tube, it undergoes certain changes during the hour it is in the tube. Over time, the blood clots and forms a gel-like substance called serum. After this hour, the serum can be separated from the blood cells through a process called centrifugation

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