The Effect of Caffeine 1% and 2% on Daphnia magna’s Heart Rate

Topics: Heart rate, Daphnia, Water flea Pages: 3 (1014 words) Published: October 21, 2014
The Effect of Caffeine 1% and 2% on Daphnia magna’s Heart Rate

Ectothermic animals are animals whose body temperature is affected by their surroundings. This means that if the environment is cold the animal will be cold. If the environment is warm the animal will be warm. This is because the animal doesn’t have the capability of regulating its body systems to keep a constant body temperature. When an ectothermic animal is cold, its heart rate will lower. When the animal is warmer, the heart rate will raise – as long as the temperature isn’t sufficiently high to harm the animal. (Campbell, 2005) Daphnia magna is a semi-transparent organism. Also it is a type of water fleas, are used to study the effects of caffeine on heart rate. It will be easy to discover and count the heart rate of Daphnia as long as the Microscope is set up correctly. The goal of this project is to measure the heart rate of Daphnia whether it will increase or decrease after a caffeine is added. Basically this lab report will explain the experiments on Daphnia and observe the effect of different beverages in different amounts on the Daphnia's heartbeat. Daphnia is an animal who lives in water and referred to as the water flea. Daphnia is a sensitive species in freshwater and many times is used as a model in biological studies. Introduction:

Daphnia consists of Antennae and eye in the head, and heart, brood pouch, eggs, ovary, intestine, and anus. There will be a use of Caffeine with concentration of %1, %2. Caffeine is a stimulant. It will make the nervous system to work faster, and it will cause the blood vessels to shrink. Both of these factors will increase the heart rate of an animal that being investigated. A Microscope will be used. A Microscope is a device that can zoom the species that being under investigated thousands of times, and it has many different lenses. My prediction for this experiment is that caffeine increases the heart beat per...

References: Campbell, Neil. Jane B. Reece. 2005. Biology, 7th ed. Beth Wilbur ed. Benjamin
Perez-Ramos, S. Couvillon. (2005). Laboratory 3, The Scientific Method. Laboratory
manual for biology 1406 Molecular and Cellular Aspects of Life.10 nd Edition.
Richland College. Dallas, Tx. Pp .4.3- 4.16.
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