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21 terms

drug final quiz 2

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among the psychoactive drugs, alcohol is classified as a
depressant
after oral administration most absorption of the drug molecules take place in the
small intestine
the process of maintaining our internal evironment within certain limits is called
homeostasis
weight control, aggression, impulsivity, and psychological depression have all been associated with
serotonin pathways
which of these is given its own classification category due to its complex effects at diff doses
marijuana
in some cases repeated use of a drug leads to pharmacodynamic tolerance which is based on
reduced sensitivity of neurons
natural chemicals in the brain that produce effects similar to those of morphine and other opium derived drugs are called
endorphins
drugs can affect neurotransmitters systems in 2 main ways: either by altering the availability of the neurotransmitter in the synapse or by
acting directly on the receptors
specialized structures that recognize neurotransmitter molecules and when activated cause a change in the electrical activity of the neuron are called
receptors
parasympathetic and sympathetic refer to the 2 branches of the
autonomic nervous system
neurotransmitter molecules are released into the small space between two neurons called the
synapse
psychoactive drugs reach the brain tissue by the way of
bloodstream
the neurotransmitter at the end organ of the sympathetic branch of the autonomic nervous system is
norepinephrine
cocaine selectively blocks Na+ (sodium) channels which is the mechanism that leads to
local anesthetic effects
neural centers controlling vomiting and respiration are found in the
brain stem
gated ion channels for sodium and potassium open and close in rapid succession causing the neuron to depolarize and then repolarze during each
action potential
drug molecules must be somewhat lipophilic (soluble in oil) in order to
readily cross the blood brain barrier
the potency of a drug is defined only in terms of
the amount required to produce an effect
nonspecific effects of taking a drug are those that do not depend on its chemical activity they are also referred to as
placebo effects
which of the following neurotransmitters is found in most parts of the brain and is considered inhibitory
GABA
when use of a drug interferes with normal behavior experienced users may learn to compensate and show less impairment than new users. this is an example of
behavioral tolerance