Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 33, Circulatory and Respiratory Systems - Assessment - 33.2 Blood and the Lymphatic System - Understand Key Concepts/Think Critically - Page 972: 15



Work Step by Step

Option b. is incorrect. Fibrinogen is a factor in blood clot formation. Option c. is incorrect. Prothrombin is the protein precursor to thrombin, an enzyme involved in blood clotting. Option d. is incorrect. Thrombin is the enzyme responsible for the formation of a blood clot. It is the converted form of prothrombin. Thrombin acts on fibrinogen, transforming it into sticky filaments called fibrin that trap blood cells so that they don't escape from the injured area. Option a. is correct. Hemoglobin is a protein in red blood cells that binds to oxygen. Hemoglobin contains iron, which gives red blood cells their red color.
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