Amphetamines produce a state of increased alertness and wakefulness by increasing the release and blocking the reuptake of what neurotransmitter?
A) acetylcholine
B) glycine
C) norepinephrine
D) serotonin
Answer: C) norepinephrine
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Which of the following statements is true about positive and negative lymphocyte selection?
A) Only positive selection is needed for proper functioning of the immune system. B) It is necessary to have lymphocytes that can fight foreign objects in the body without harming its own tissues. C) In both instances, lymphocytes die after they do their job. D) In both instances, antigens do not recognize pathogens in the body.
Drowning is often the introduction of outside water into the alveoli, yet some water is normally present in alveoli. Why is water normally present in the alveoli? What is present in alveolar fluid, besides water, that aids in respiration? What properties of water are detrimental to respiration? What causes drowning? While extremely rare, there have even been documented cases of people walking
away from recreational swimming only to die later, on dry land, as a result of drowning (termed "delayed" or "secondary" drowning). Propose an explanation for delayed drowning. What will be an ideal response?
Clostridium botulinum toxin inhibits acetylcholinesterase
Indicate whether the statement is true or false
A blood clot attached to a blood vessel wall is called a(an)
A. thrombus. B. embolus. C. prostacylin. D. hemorrhage. E. anticoagulant.