Where a poem makes reference to another poem or text. For example, the 14th line of The Prelude by William Wordsworth 'The earth was all before me' alludes to one of the final lines of Paradise Lost by John Milton 'The world was all before them'. Paradise Lost, in turn, alludes to the story of Adam and Eve in Genesis.
Beta-blockers are drugs that bind to beta-adrenoceptors and thereby block the binding of norepinephrine and epinephrine to these receptors. This inhibits normal sympathetic effects that act through these receptors. Therefore, beta-blockers are sympatholytic drugs.
Uses. Beta blockers are widely known as beta-adrenergic blocking agents, these block adrenaline from binding to the beta receptors on the nerves. Beta blockers are used primarily in the treatment of cardiac arrhythmia and high blood pressure.eta Receptors. To best explain what a beta blocker does, you need to understand a little bit about the nervous system and what beta receptors are. A beta receptor is a protein molecule that processes specific messages carried by the central nervous system and various hormones.