How often does a heart beat? For a zebrafish, it depends on the water it's swimming in. Ellen Du Pre, professor of biology at Central College, is working with four students, as well as biology colleague Nicole Palenske, to study the effects of triclosan on heart rate. The tiny fish, which can be as small as an eyelash when newly hatched, is transparent, and the students can easily count the heart beats under a microscope.
URL: http://www.news-medical.net/news/20130216/Central-College-to-study-effects-of-triclosan-on-heart-rate.aspx
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