What cells release histamine when they recognize antigen-antibody complexes?

What cells release histamine when they recognize antigen-antibody complexes?
 
  A) Mast cells
  B) Helper T cells
  C) Antigens
  D) Lymphocytes

Question 2

Your patient is a 40-year-old woman who has been experiencing abdominal pain and vomiting for two days. She is now responsive to verbal stimulus; has cool, dry skin; a heart rate of 116; respirations of 24; and a blood pressure of 100/70. Which of the following is the BEST position for transporting this patient?
 
  A) Supine with the knees bent
  B) Left lateral recumbent with the legs bent
  C) Sitting up at a 90-degree angle
  D) Sitting up at a 45-degree angle

Question 3

While palpating your patient's neck, you notice a rice crispy feel. This is known as:
 
  A) subcutaneous edema.
  B) rebound tenderness.
  C) subcutaneous emphysema.
  D) crepitation.