Examlex
Which of the following terms is defined as anything that has mass and occupies space?
Endothelial Cells
Cells that line the interior surface of blood vessels and lymphatic vessels, forming an interface between circulating blood or lymph in the lumen and the rest of the vessel wall.
Valves
Structures present in the heart and veins that prevent the backward flow of blood, ensuring unidirectional blood flow throughout the circulatory system.
Pharyngeal Tonsils
Lymphoid tissue located in the back of the nasopharynx, often referred to as adenoids when swollen.
Adenoids
Lymphatic tissue located in the nasopharynx that helps in immune defense against pathogens.
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