Final answer:
During the hour that the blood sample was in the glass tube, the blood may have clotted and the cells may have settled to the bottom of the tube. The technician harvests the serum from the clot for further analysis.
Step-by-step explanation:
During the hour that the blood sample was in the glass tube, several things have occurred. Firstly, the blood may have clotted, forming a gel-like substance called a clot or coagulum. This clotting process helps to stop bleeding and is an essential part of the body's defense mechanism against injury. Additionally, some of the blood cells may have settled to the bottom of the tube due to gravity, separating from the serum, which is the liquid part of the blood. After about an hour, the lab technician harvests the serum for further analysis. The serum is the clear, yellowish liquid that remains after the blood has clotted and the clot has been removed. It contains various components, such as electrolytes, hormones, antibodies, and proteins, that can provide valuable information about a person's health.