This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
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 frog’s heart was beating at 38 beats per minute and after the influence of Epinephrine the frog’s heart rate jumped to 48 beats per minute. Acetylcholine has a depressing effect on the heart. Before acetylcholine was administered the frog’s 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...
View Full Document
- Fall '08
- heart rate