Inhaling or "huffing" is a way to achieve a high, usually by breathing in a fat-soluble substance. Which of the following structures would be most likely attacked first?
A) neuron B) myelin sheath C) axon D) dendrite
Answer: B
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. If the efficiency of the alveoli in an human was reduced by 50%, what would you predict would be the effect?
A. The volume of air in the lungs would decrease by 50%. B. The rate of gas exchange would decrease by 50%. C. The affinity of hemoglobin for oxygen would decrease by 50%. D. The muscular control of breathing would decrease by 50%.
Select all innate immune defenses that are considered to be physical barriers.
Which of the following organisms is not capable of causing meningitis?
A) Neisseria meningitidis B) Haemophilus influenzae C) Cryptococcus neoformans D) Streptococcus pneumoniae E) None of the above
Duplication of DNA occurs
A. during interphase. B. before meiosis II only. C. during prophase I. D. twice, before meiosis I and meiosis II.