Asthma is
A) a collapsed lung resulting from insufficient production of surfactant.
B) due to an excessive stimulation of smooth muscle in bronchioles.
C) an obstructive tumor targeting primarily the terminal bronchioles.
D) characterized by fluid buildup in the alveoli.
E) caused by Mycobacterium tuberculosis.
B
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The "first line" of cellular defense against pathogenic invasion is __________.
a. interferons b. the complement system c. phagocytes d. pathogens
The part of the hair that extends beyond the skin surface is called the
A. shaft. B. root. C. bulb. D. papilla. E. alopecia.
Red blood cells (RBC's) have a prototypical cell structure with a nucleus and cell organelles.
a. true b. false
Why is pituitary growth failure less common today in the United States?
A) Because children have smaller pituitary glands which function more effectively at producing growth hormone. B) Because children have larger pituitary glands which function more effectively at producing growth hormone. C) Because children have better diets and are more nourished allowing greater growth hormone production. D) Because children can be treated with synthetic human growth hormone if they are deficient. E) Because children can receive a pituitary gland transplant if they are deficient in growth hormone.