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ekruge01
on FreezingBlue Flashcards.
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what is a membrane potential?
term used to indicate the differences in ion balances between the inside and outside of the cell.
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what is membrane potential measured in?
millivolts (mV)
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the outside of the cell has more what than inside the cell?
cations (positively charged ions)
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the cell membrane has pumps in it which?
actively transport K+ and Na+ ions
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what is another name for an action potential?
nerve impulse
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what is the pathway for an action potential?
STIMULUS-> Na+ moves into the cell causing "depolarization"-> K+ moves out of the cell causing "repolarization" (resetting back to resting state)
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what are neurotransmitters?
chemicals which get released from dendrites and "ferry" the impulse across a small gap to the next neuron
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what is another name for sympathomimetics?
adrenergic (agonist) drugs
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what are sympathomimetics?
mimic the actions of the catecholamine neurotransmitters (epi, norepi, and/or dopamine), so they trigger SNS stimulation.
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what does stimulation of the alpha adrenergic cause? what does it lead to?
peripheral vasoconstriction-> increase BP
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what does stimulation of beta adrenergic receptors cause?
- 1. increase in P
- 2. bronchiodilation
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what kind of effects does sympathomimetics have?
- 1. + inotropic effect
- 2. + chronotropic effect
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what are the other names for sympatholytics?
- 1. adrenergic antagonist
- 2. adrenergic blocking drugs
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what are sympatholytics?
inhibit SNS activity, thereby allowing therapeutic effects which counter the stress response.
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