🔖Practice question #67
A 2-year-old boy presents with his parents to the emergency room with an episode of acute abdominal pain. According to the patient's dad, this is the second such episode today, and the first episode self-resolved within 15 minutes and was accompanied by some bloody stools. Other than a recent stomach bug, the boy is otherwise very healthy. Using abdominal ultrasound, the boy is diagnosed with small bowel intussusception. What is the defense mechanism provided by the tissue that served as lead point for the development of intussusception in this child?
A) Ability to acquire active immunity to transient infections
B) Ability to activate cytotoxic T cells
C) Ability to activate the complement cascade to identify pathogenic bacteria
D) Ability to distinguish between self-antigens and foreign antigens
E) Ability to present antigens to B cells
Source: usmle_rx_qbank #2017 #immunology
A 2-year-old boy presents with his parents to the emergency room with an episode of acute abdominal pain. According to the patient's dad, this is the second such episode today, and the first episode self-resolved within 15 minutes and was accompanied by some bloody stools. Other than a recent stomach bug, the boy is otherwise very healthy. Using abdominal ultrasound, the boy is diagnosed with small bowel intussusception. What is the defense mechanism provided by the tissue that served as lead point for the development of intussusception in this child?
A) Ability to acquire active immunity to transient infections
B) Ability to activate cytotoxic T cells
C) Ability to activate the complement cascade to identify pathogenic bacteria
D) Ability to distinguish between self-antigens and foreign antigens
E) Ability to present antigens to B cells
Source: usmle_rx_qbank #2017 #immunology