Frog Heart

Frog Heart - reject my original hypothesis gaining...

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Biol2161 4/1/10 Frog Heart Introduction Acetylcholine and epinephrine are chemical messengers that our body produces naturally. Acetylcholine is a product of the parasympathetic nervous system while epinephrine is secreted by the adrenal medulla. Question Will acetylcholine and epinephrine have any effect on heart rate and force of contraction? H(o): No they will have no effect. H(a): Yes they will have an effect. Methods Used in this experiment was: a pin writer, Ringer’s solution, frog, 1/50 solution of Acetylcholine, 1/1000 solution of Epinephrine. The frog’s heart is linked to the pin writer while the heart is kept moist by the Ringer’s solution. The frog’s heart is than flushed with the 1/1000 solution of epinephrine and recorded than flushed with the 1/50 solution of acetylcholine and is recorded again. Results Graph: Both Epinephrine and Acetylcholine have effects on heart rate and contraction so therefore I
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Unformatted text preview: reject my original hypothesis gaining confidence. Discussion: Epinephrine has a stimulating effect on the heart. Once the heart is under the influence of Epinephrine the rate speeds up and force of contraction is harder and stronger. Before Epinephrine the frogs heart was beating at 38 beats per minute and after the influence of Epinephrine the frogs heart rate jumped to 48 beats per minute. Acetylcholine has a depressing effect on the heart. Before acetylcholine was administered the frogs heart was beating at a rate of 46 beats per minute. After acetylcholine was administered the rate went down to 12 beats per minute. The force of contraction also decreased. Sources: Video watched in class. http://www.umbc.edu/bioclass/biol305l/LabExercise7/FrogCVPhysiology.htm...
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Frog Heart - reject my original hypothesis gaining...

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