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.

QUIZZES

Are you aware how often people swap around “their,” “there,” and “they’re”? Prove you have more than a fair grasp over these commonly confused words.

Question 1 of 7

Which one of these commonly confused words can act as an adverb or a pronoun?

Fluoride first entered an American water supply through a rather inelegant technocratic scheme.
Anti-Fluoriders Are The OG Anti-Vaxxers|Michael Schulson|July 27, 2016|DAILY BEAST
In the first episode, an officer is shown video of himself shooting and killing a man.
'Babylon' Review: The Dumb Lives of Trigger-Happy Cops|Melissa Leon|January 9, 2015|DAILY BEAST
But since those rosy scenarios were first floated, the California political scene has grown more crowded.
The Golden State Preps for the ‘Red Wedding’ of Senate Races|David Freedlander|January 9, 2015|DAILY BEAST
Eric Garcetti succeeded Villaraigosa and has received high marks in his first year and a half on the job.
The Golden State Preps for the ‘Red Wedding’ of Senate Races|David Freedlander|January 9, 2015|DAILY BEAST

He sees himself as the first Muslim president of all Europe.
Houellebecq’s Incendiary Novel Imagines France With a Muslim President|Pierre Assouline|January 9, 2015|DAILY BEAST
This is the first and principal point at which we can stanch the wastage of teaching energy that now goes on.
The Salvaging Of Civilisation|H. G. (Herbert George) Wells
He was converted and baptized, and was the first Hebrew instructor at Harvard college.
The Every Day Book of History and Chronology|Joel Munsell
And I have not had the first morsel of food prepared from this grain offered me since I reached the shores of Europe.
Glances at Europe|Horace Greeley
Sol laughed out of his whiskers, with a big, loose-rolling sound, and sat on the porch without waiting to be asked.
The Bondboy|George W. (George Washington) Ogden
The blood that accused his friend in his heart, rushed to his face, when he repeated what had been told him.
The Pastor's Fire-side Vol. 3 of 4|Jane Porter