Texas A&M University (TAMU) BIOL 319 Integrated Human Anatomy and Physiology I Lab 4 Practice Test

Clotting primarily starts with platelets acting as the first responders to vascular injury. They quickly stick to exposed collagen, form a platelet plug by linking with each other, and release chemicals that recruit more platelets to amplify the response. This platelets-on-the-vessel-wall setup also provides a surface for coagulation factors to assemble, accelerating the conversion of fibrinogen to a stable fibrin mesh that seals the break. Red and white blood cells can become trapped in the forming clot, but they aren’t the drivers of the initial clot formation. While clotting factors dissolved in plasma are essential for creating the fibrin network, the key cellular player that initiates and sustains the process is the platelet.