Your patient has been complaining about headaches, lightheadedness, upset stomach, weight loss, and a rapid heartbeat. You run some tests and notice that the patient's stomach lining has thinned; you also suspect that he has a vitamin B12 deficiency. What could cause a lack of vitamin B12 absorption in the stomach?

A. Underproduction of mucus
B. Insufficient intrinsic factor
C. Hyposecretion of pepsinogen
D. Pernicious anemia


Answer: B

Anatomy & Physiology

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