Which of the following substances, if introduced into the blood stream, cause coagulation of blood at the site of its introduction?
A. Fibrinogen
B. Prothrombin
C. Heparin
D. Thromboplastin
Answer:D
Which of the following substances, if introduced into the blood stream, cause coagulation of blood at the site of its introduction?
A. Fibrinogen B. Prothrombin C. Heparin D. Thromboplastin