Question

Which of the following substances, if introduced into the blood stream, would cause coagulation of blood at the site of its introduction?

• A. Thromboplastin
• B. Thrombin
• C. Heparin
• D. Prothrombin

Answer 1

The correct option is A Thromboplastin

Thromboplastin is the substance, which if introduced into the blood stream, would cause coagulation of blood at the site of its introduction.

In the presence of calcium ions, thromboplastin is necessary for the conversion of prothrombin to thrombin, an important step in blood coagulation.

Heparin is an anticoagulant.