Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 6 - Assess - Page 130: 12


A. Prothrombin activator, prothrombin, thrombin

Work Step by Step

Platelets and injured tissues release a prothrombin activator at the site of a damaged blood vessel. This prothrombin activator converts prothrombin into thrombin. Thrombin then acts as an enzyme that severs two amino acid chains from a fibrinogen molecule. These severed amino acid chains bond together to form a blood clot.
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