The "first line" of cellular defense against pathogenic invasion is __________.
a. interferons
b. the complement system
c. phagocytes
d. pathogens
Answer: c. phagocytes
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Which of the following is chemically inert (unreactive)?
A) carbon (atomic number 6) B) oxygen (atomic number 8) C) neon (atomic number 10) D) sodium (atomic number 11)
Define atrophy
What will be an ideal response?
What prevents food from entering the nasal passages during swallowing?
a. elevation of the uvula b. contraction of the pharyngeal muscles c. positioning of the tongue d. tight apposition of the vocal cords over the glottis e. elevation of the epiglottis over the nasopharynx
According to the Frank-Starling principle, a more powerful contraction results in
A) decreased stroke volume. B) increased stroke volume. C) no change in stroke volume. D) decreased cardiac output. E) a slower heart rate.