Which of the following statements is true about nicotine?
A. Several minutes are required for smokers to feel its effects.
B. In the brain, it stimulates the release of adrenaline and endorphins.
C. It is actually one of the less addictive substances in tobacco.
D. The body does not build up a tolerance for nicotine.
B. In the brain, it stimulates the release of adrenaline and endorphins.
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What is the absolute refractory period? Choose the correct option
A) The period when the firing frequency is at about 1000 Hz. B) The time period of 1 msec after one action potential is initiated and before the next one is initiated. C) The period when it is difficult to initiate another action potential for several milliseconds due to sodium channel inactivation. D) The period when the membrane potential stays hyperpolarized until the voltage-gated potassium channels close.
Describe three of the potential safety issues related to herbal remedies and natural products. For each issue you list, provide specific examples.
What will be an ideal response?
Which statement best describes a "fee-for-service" insurance plan?
a. a plan in which the insurance carrier pays a percentage of covered medical expenses after a deductible b. the percentage of costs for medical expenses that the insured person must pay after a deductible c. a prepaid type of insurance care plan in which the costs are capitated d. an annual amount the individual must pay for medical expenses before the insurance company begins paying
Which of the following statements about a buffer is correct?
A. buffers often consist of a weak acid and its conjugate base B. a buffer resists pH change C. a buffer removes hydrogen ions from solution D. All of these answers are correct