Dictionary » R » Refractory



Not readily yielding to treatment.

Origin: L. Refractorius

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Re: sensory question

... but my answer to your dilemma is that the action potential has many components. It's amplitude is normally a constant or varies little, but the refractory period may vary. I suspect the refractory period (time from stimulation to membrane recovery on a single neuron) might shorten under the ...

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by RLBallantyne
Tue Jun 19, 2012 10:14 pm
Forum: Cell Biology
Topic: sensory question
Replies: 2
Views: 3497

Neurons, Cocaine, and Shingles

1. While under the influence of cocaine, some users report prolonged feelings of pleasure because dopamine a) reduces the refractory period of neurons b) remains in the synapse longer than normal c) increases the speed of nerve impulse transmission d) diffuses rapidly throughout the ...

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by homeworkdisaster
Sun Jun 10, 2012 8:11 pm
Forum: Human Biology
Topic: Neurons, Cocaine, and Shingles
Replies: 4
Views: 5454

Impulse propagation/local circuits and repolarisation

... because, the influx of sodium ions is attracted to the surrounding negative regions, they then move to the negative region ahead (not behind as in refractory period) which causes depolarisation etc and the process repeats. What i'm thinking is....does the very movement of the sodium ions, due to ...

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by ADAS137
Sat Dec 31, 2011 4:16 pm
Forum: Human Biology
Topic: Impulse propagation/local circuits and repolarisation
Replies: 1
Views: 1573

Action Potential

... be more steep 3. The falling phase would have a steeper slope 4. The amplitude of the action potential would be increased by 50% 5. The relative refractory period would be affected 6. The threshold for action potential generation would be more negative (hyperpolarized) 7. The nadir (most negative ...

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by sugars888
Thu Sep 29, 2011 5:12 am
Forum: Physiology
Topic: Action Potential
Replies: 5
Views: 7780


In general, the safety rules for patients suffering from advanced, metastatic cancer, whose disease has proved refractory to existing drugs and other therapies (eg radiotherapy, surgery), can be laxer because, to put it grimly, they are so 'up against it' that they are prepared ...

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by Julie5
Sat Nov 06, 2010 8:01 pm
Forum: Cell Biology
Topic: Thalidomide
Replies: 5
Views: 9557
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