The Normal Heart Rate Of A Daphnia Magna

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Introduction The purpose of this lab was to determine the normal heart rate of a Daphnia Magna and decipher the different effects that various substances had on it. A Daphnia Magna is a species of water fleas and can be located in the Northern United Sates against the coastline of the Atlantic in rocky pools. The water flea’s habitat consists of rivers and streams, temporary pools, lakes and ponds, and brackish water. The Daphnia Magna range from two to five millimeters in length and are shaped like a kidney bean (Elenbaas, Molly). Relating to this lab experiment we learned in class that the normal heart rate is measured anywhere between 60 and 100 beats per minute (BPM). If your resting BPM is measured at a level above the number 100 it is known as Tachycardia. This term indicates that your heart level has exceeded the normal range. Also if your heart rate is indicated below 60 then it is called Bradycardia, which means the heart is beating slower than normal. When your heart rate is affected by a substance in the body it is called a Chronotropic agent. When the heart rate decreases because of a substance or chemical it is called a negative Chronotropic and when it is affected oppositely by increasing it is known as a positive Chronotropic agent. In this experiment we added many different substances to the slide on which the water flea was placed to calculate the increase or decrease in its heart rate due to the ingredients in the substances. The first substance used was

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