TINY AIR PARTICLES CAN CAUSE HEART ATTACK High levels of air pollution can trigger heart attacks in at – risk people exposed for even a short time, a study has found. Researchers who interviewed 772 Boston – area patients about 4 days after their attacks found that the onset of symptoms correlated with times of high daily air pollution. Tiny, invisible particles have long been thought to cause long – term cardiovascular diseases. The new study is the first to examine short – term effects on the heart, said senior author Dr. Murray Mittleman, Director of Cardiovascular Epidemiology at Boston‟s Beth Israel Deacomess Medical Centre.
The study of 489 men and 283 women, conducted from January 1995 to May 1996, defined at – risk people as obese, inactive or with a history of heart problems. It appears in Circulation, Journal of the American Heart Association
What part of speech is heart?
a) Noun
b) Verb
c) Adjective
d) None of the above
Answers
While' has multiple parts of speech, depending on the context of the sentence. 'While' as an adverb modifies a verb, an adjective or another adverb, it means 'during which'. As 'while' does not modify any of these in the given sentence, option A is incorrect. 'While' as a noun does not modify pronouns, and 'you' is a pronoun, also, 'while' (noun) refers to 'a period of time', as it doesn't refer to any period of time here, it is not a noun and option B is incorrect. Prepositions and conjunctions may have the same words, but they are distinguished depending on their function. A preposition links the noun or pronoun to the rest of the sentence, without which the sentence would not be complete in its meaning, like 'on' in 'on the table' or 'into' in 'into the street', whereas a conjunction links a clause or a sentence to another clause or sentence, "you sleep" is a clause, hence 'while' is a conjunction and not a preposition. Hence, option C is incorrect and Option D is correct.
subscribe me InDiAn GaMeR
Explanation:
The primary function of enzymes in the saliva is to convert: The cell membrane of an amoeba changes its shape to trap food. What are these
structures called