first heart sound

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The heart sound that occurs with ventricular systole and is produced mainly by closure of the atrioventricular valves.

QUIZ

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Test how much you really know about regular and irregular plural nouns with this quiz.

Question 1 of 9

Which of the following nouns has an irregular plural form?

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Fluoride first entered an American water supply through a rather inelegant technocratic scheme.
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In the first episode, an officer is shown video of himself shooting and killing a man.
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But since those rosy scenarios were first floated, the California political scene has grown more crowded.
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Eric Garcetti succeeded Villaraigosa and has received high marks in his first year and a half on the job.
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He sees himself as the first Muslim president of all Europe.
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This is the first and principal point at which we can stanch the wastage of teaching energy that now goes on.
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He was converted and baptized, and was the first Hebrew instructor at Harvard college.
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And I have not had the first morsel of food prepared from this grain offered me since I reached the shores of Europe.
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Sol laughed out of his whiskers, with a big, loose-rolling sound, and sat on the porch without waiting to be asked.
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The blood that accused his friend in his heart, rushed to his face, when he repeated what had been told him.
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