A blocker is the inverse of a filter. Instead of blocking everything like the filter does, it lets everything else pass and blocks only the things specified. The term filter may refer to: A device to separate mixtures. ...
For instance, an infrared blocker blocks out infrared light, and lets visible light (among other wave lengths) pass through. An infrared filter blocks the visible light and lets only the infrared pass. Image of a small dog taken in mid-infrared (thermal) light (false color) Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation. ...
The term "blocker" is also used in cell phone terminology. [1]
Beta blockers block the action of endogenous catecholamines, epinephrine (adrenaline) and norepinephrine (noradrenaline) in particular, on β-adrenergic receptors, part of the sympathetic nervous system which mediates the "fight or flight" response.
Although beta blockers were once contraindicated in congestive heart failure, as they have the potential to worsen the condition, studies in the late 1990s showed their positive effects on morbidity and mortality in congestive heart failure (Hjalmarson, 2000; Leizorovicz, 2002; Packer, 2002).
Still, use of beta blockers to combat the physical symptoms of anxiety is not uncommon, particularly among performers, and there are studies which confirm their efficacy as anxiolytics.
Calcium channel blockers are used to treat high blood pressure, to correct abnormal heart rhythms, and to relieve the type of chest pain called angina pectoris.
Calcium channel blockers are a class of drugs with effects on many excitable cells of the body, like the muscle of the heart, smooth muscles of the vessels or neuron cells.
Many calcium channel blockers also slow down the conduction of electrical activity within the heart, by blocking the calcium channel during the plateau phase of the action potential of the heart (see: cardiac action potential).
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