Allergies & Respiratory Drugs

• stimulate production of antibodies in blood & tissue:

  antigens
• Histamine is released into the blood when this substance comes in contact with the skin or lungs


  antigens
• Antihistamines alleviate the symptoms of allergic reactions by


  blocking histamine receptors
• Antiallergic agents prevent _____ from releasing histamine.

  mast cells
• When histamine causes dilation of small blood vessels and capillaries, it results in ______


  a drop in blood pressure
• Symptoms of an allergic reaction indicates that an individual has ______ to certain antigens in the environment.

  sensitization
• Mast cells, containing granules of bioactive substances, are found in the highest concentrations in the which of the following?

  • Lungs
  • GI tract
  • Skin