For the first time ever, scientists have recorded the heart rate of the world’s largest creature: the blue whale. To get this reading, they attached an electrocardiogram device to the body of a whale. They found that the mammal’s heart rate can slow to just two beats a minute as the animal searches for food below the surface of the ocean. The highest heart rate they recorded was 37 beats a minute after the whale returned to the surface for air. The team’s study appears online in the publication Proceedings of the National Academy of Sciences. The blue whale is the largest animal that has ever lived. It can grow to 30 meters long and weigh as much as 181,000 kilograms. The animal’s heart alone weighs more than a fully grown cow.
Title: Scientists Get First-Ever Measure of Blue Whale Heart Rate
Content: <div id='article-page'><div id='article-content' data-media-url='//news-app-staging.s3.amazonaws.com' data-base-url='//news-app-staging.herokuapp.com' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/cow.wav' data-capture-url='//staging.analytics.lingraphica.com/events/capture_news' data-article-title='Scientists Get First-Ever Measure of Blue Whale Heart Rate' data-article-id='4342'><script src='//news-app-staging.herokuapp.com/javascripts/getscripts.js'></script><link rel='stylesheet' href='//news-app-staging.herokuapp.com/stylesheets/article.css' type='text/css' /><div class='article'><p><span data-start-time='0' data-end-time='9146'>For the first time ever, scientists have recorded the heart rate of the world’s largest creature:</span> <span data-start-time='9146' data-end-time='11375'>the blue whale.</span> <span data-start-time='11375' data-end-time='20583'>To get this reading, they attached an electrocardiogram device to the body of a whale.</span> <span data-start-time='20583' data-end-time='35354'>They found that the mammal’s heart rate can slow to just two beats a minute as the animal searches for food below the surface of the ocean.</span> <span data-start-time='35354' data-end-time='46479'>The highest heart rate they recorded was 37 beats a minute after the whale returned to the surface for air.</span> <span data-start-time='46479' data-end-time='55771'>The team’s study appears online in the publication Proceedings of the National Academy of Sciences.</span> <span data-start-time='55771' data-end-time='61188'>The blue whale is the largest animal that has ever lived.</span> <span data-start-time='61188' data-end-time='71396'>It can grow to 30 meters long and weigh as much as 181,000 kilograms.</span> <span data-start-time='71396' data-end-time='77813'>The animal’s heart alone weighs more than a fully grown cow.</span> </p></div><div class='control-buttons-sticky' style='display:none;'><div class='control-buttons'><button title='Back' class='back' disabled='disabled'></button><button title='Play' class='play' disabled='disabled'></button><button title='Pause' class='pause' style='display:none;'></button><button title='Forward' class='forward' disabled='disabled'></button><button class='finished-reading' style='display:none;'>Done</button></div></div></div><div id='article-media'><div id='media-image'><img src='https://news-app-production.s3.amazonaws.com/articles/3798/cow.jpg'/></div></div><div id='question-content' style='display:none;'><div class='vocabulary_question question-container' data-question-id=14103 data-hint-location='46479' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/what_does_proceeding_mean.wav'>What does proceeding mean?</div><div class='choices' data-correct-choice='course of action'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/method_of_measurement.wav'><span>method of measurement</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/course_of_action.wav'><span>course of action</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/length_and_weight.wav'><span>length and weight</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/below_the_surface.wav'><span>below the surface</span></div></div></div><div class='multiple_choice_question question-container' data-question-id=14104 data-hint-location='55771' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/what_is_the_worlds_largest_animal.wav'>What is the world's largest animal?</div><div class='choices' data-correct-choice='the blue whale'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/a_fully_grown_cow.wav'><span>a fully grown cow</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/the_blue_whale.wav'><span>the blue whale</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/a_mammal_heart.wav'><span>a mammal heart</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/the_last_dinosaur.wav'><span>the last dinosaur</span></div></div></div><div class='sentence_completion_question question-container' data-question-id=14105 data-hint-location='20583' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/the_heart_rate_can_slow_to__blank__beats_per_minute.wav'>The heart rate can slow to <span class='blank'>2</span> beats per minute.</div><div class='choices' data-correct-choice='2'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/2.wav'><span>2</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/37.wav'><span>37</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/zero.wav'><span>zero</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/fewer.wav'><span>fewer</span></div></div></div><div class='question-buttons'><button class='skip-button'></button><button class='hint-button'></button><button class='speak-button'></button></div></div></div>
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