Question

multiple choice question
what is the first procoagulant that the extrinsic and intrinsic pathways have in common?

hageman factor

factor x

prothrombin activator

thromboplastin

Explanation:

To solve this, we analyze the coagulation pathways:

• The intrinsic pathway starts with Hageman factor (Factor XII) and proceeds through a series of factors.
• The extrinsic pathway starts with tissue factor (thromboplastin) and Factor VII.
• The first procoagulant common to both pathways is Factor X. Hageman factor is only in the intrinsic pathway. Prothrombin activator is formed later, and thromboplastin is in the extrinsic pathway.

Answer:

B. Factor X (assuming the options are labeled A: Hageman factor, B: Factor X, C: Prothrombin activator, D: Thromboplastin)