Are these sentences correct in American English Language?<br/><br/>1)I heard a whisper. do we need that (a) before whisper.<br/><br/>2)Being born with a heart arrhythmia is tough. Do need that (a) before heart?<br/><br/>Thanks <img class='emoticon' style='Width:19px;Height:19px;' data-delaysrc='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/1.gif' src='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/1.gif' alt='Emotion: smile'/>