Wormbeat Lab

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by Melchor2
Last updated 6 years ago

Discipline:
Science
Subject:
Biology

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Wormbeat Lab

Materials:1. worm2. tray3. petri dish4. filter paper5. thermometer6. ice7. timer

Procedure:1. Dampen a filter paper with water and put it in a petri dish.2. Fill a pan with room temperature water and take the temperature of it (℃) and record.3. Get an earthworm and gently rinse it. Place the worm in the lined petri dish. If the worm is "wiggly" try to calm it down or get a different one.4. Find the dorsal blood vessel throughout the worms back.5. Count the number of contractions in 1 minute and record.6. Repeat step 5 for 3 trials and record7. Take the average of the trials and record.8. Add ice to the tray until it gets to 10℃ and keep it there. Allow the worm to settle.9. again repeat step 5 for the 10℃ water 3 times and record.10. Return all lab supplies and return the worm.11. Report data for both temperatures to the class, and copy all data for the class data. Calculate the class averages.

Wormbeat LabHow does a change in environmental temperature affect the circulation of blood in earth worms?

Worm's Heart Rate in Room temp. and cold water

Class Data Of A worms Heart Rate In Room Temp. and Cold Water

Controlled Variable:The room temperature water is controlled by not heating or cooling.

Conclusion:When the enviroment around the earthworm goes down, the worm's pulse rate slows down, and vice versa. In the end, according to the class data(averaged), in the room temperature water the worm's heart rate is 16.88 contractions per minute. And in the cold water at 10℃ the worm's Heart rate was at 10.61 contractions per minute. Since worms are ectothermic our results make sense because the worm's heart rate is adjusting to it's environmnt. These results wouldn't be true for humans because we are endotherms, and worms are again ectotherms.

Human Errors:1. Couldn't count the pulse precisely.Procedural Error:1.Difficult to know how much ice to put-Modification: Have a suggested amount


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