Why would an individual with atopic allergic asthma experience difficulty breathing?
A. IgE antibodies bind to the inhaled antigens, causing an inflammatory reaction that decreases gas exchange.
B. Mast cells, which stimulate vasodilation of the airways, are less active in persons with allergies.
C. Leukotrienes cause constriction of the bronchioles, producing airway obstruction.
D. All of the choices are correct.
Answer: C
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The canal connecting the third and fourth ventricles and running through the midbrain is the interventricular foramen
Indicate whether the statement is true or false
The common name for the nuchal crest is the __________
Fill in the blank(s) with correct word
How are chemical reactions represented?
A) Reactions are represented by line plots and the line represents the direction of the reaction. B) Reactions are represented by a sine wave and the slope represents the direction of the reaction. C) Reactions are represented by chemical equations and the arrow represents the direction of the reaction. D) Reactions are represented by Lewis structural models and the total number of atoms represents the direction of the reaction. E) Reactions are represented by superscripts and subscripts and the charge represents the direction of the reaction.
Natural killer cells:
A. are activated by IL-2 and interferon-gamma. B. only attack bacteria. C. cannot interact with antibodies. D. secrete interferon-gamma to activate helper T-cells. E. have primary responsibility for mass-manufacturing antibodies against foreign antigens.