A. A. A. Beta-blockers are drugs used to treat high blood pressure. They block the effects of the sympathetic nervous system on the heart. This reduces the work of the heart so that it requires less blood and oxygen. As a result, the heart doesn't have to work as hard, which in turn lowers blood pressure.. A. Beta-blockers are drugs used to treat high blood pressure. They block the effects of the sympathetic nervous system on the heart. This reduces the work of the heart so that it requires less blood and oxygen. As a result, the heart doesn't have to work as hard, which in turn lowers blood pressure.
sliver noun [C]. âº a very âsmall, âthin âpiece of something, usually âbroken off something âlarger: a sliver of âglass Just a sliver of âcake for me, âplease-I shouldn't really be having any. (Definition of sliver from the Cambridge Advanced Learnerâs Dictionary & Thesaurus Â© Cambridge University Press). See all translations.
wisp (countable and uncountable, plural wisps) A small bundle, as of straw or other like substance; any slender, flexible structure or group. A wisp of smoke rose from the candle for a few moments after he blew it out. A wisp of hair escaped her barrette and whipped wildly in the wind. Dryden in a small basket, on a wisp of hay. A whisk, or small broom.