alleryStart learning →Which clotting factor is deficient in hemophilia B?
AFactor VIII
BFactor IX
CFactor XI
DFactor X
Answer & Solution
Correct answer: B. Factor IX
1. Hemophilia B is the second most common form, at approximately 20 percent of cases.
2. It is a deficiency of factor IX, the antihemolytic factor B.
3. The name of the factor carries the same letter as the disease, which is a reliable check.
4. Factor VIII deficiency is hemophilia A and factor XI deficiency is hemophilia C, so both are different diseases.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.5 Hemostasis_
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