Examlex
_____ are to _____ as fingerprints and DNA are to detectives.
Exchange
The process of trading or swapping substances or values, which in a biological context often refers to the transfer of gases or nutrients between cells and their environment.
Endothelium
Layer of flat cells lining blood and lymphatic vessels and the chambers of the heart.
Precapillary Sphincters
Circular muscular valves located at the entrance of capillaries, regulating blood flow into the capillary beds according to the body's needs.
Tunica Media
Middle, usually muscular, coat of an artery or another tubular structure.
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