• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Does caffeine affect the heart rate?

Extracts from this document...

Introduction

Does caffeine affect the heart rate? Introduction The object of this experiment is to see the affects of caffeine on organisms and how potentially lethal it can be under certain circumstances. For this experiment I will be using daphnia (the water flea) as it has a very thin membrane meaning the caffeine will affect it almost instantaneously and its heart is visible through a microscope as it has a translucent membrane coating it. I believe that the caffeine will significantly affect the heart rate and behaviour of the daphnia as caffeine is a stimulant so speeds up the processes of the brain including respiratory and cardiac cycles. ...read more.

Middle

0 0 100 0.01 2 98 0.05 10 90 0.1 20 80 0.5 100 0 Variables other variables to consider when doing this experiment are temperature as it can affect the heart rate of the daphnia and cause outliers in my results, the size of the daphnia as this may affect their behaviour/activity meaning the results would be inconclusive, time exposed to each concentration so that each daphnia has absorbed as much caffeine so its bpm is similar in each result. Method For the experiment I will place a daphnia on the slide and will leave it exposed to the caffeine concentration for 5 minuets then count its heart rate for 1 minute, I will perform each concentration twice to try to reduce random and systematic errors that could be caused in the experiment e.g. ...read more.

Conclusion

TIME OF DEATH 9:42 0.3 129 177 177 186 0.2 177 192 201 210 Our results may be inaccurate as different fleas were used for concentrations 0.2 and 0.3 which could make our results inconclusive. Conclusion I think that the experiment supported my hypothesis of caffeine increasing the heart rate of the daphnia as the higher the concentration the higher the heart rate in our 1st flea, after that the results were less conclusive, if I had the chance to re do the experiment I would do more concentrations and find a more accurate was of counting the bpm as well as making sure that we use the same flea for every experiment as to get more reliable results. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Humans as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Humans as Organisms essays

  1. Marked by a teacher

    Does Caffeine Affect Heart Rate?

    4 star(s)

    APPARATUS: Culture of Daphnia Cavity slides and cover slips; Dropping pipettes Distilled water Cotton wool Caffeine tablets Stop clock Paper towel/ filter paper Microscope Lamp HYPOTHESIS: I believe that an increase in caffeine concentration in the surrounding water on the daphnia results in an increase in heart rate.

  2. Marked by a teacher

    Does Caffeine affect Heart Rate?

    3 star(s)

    Time the heart rate using a stopwatch once again for 1 minute. (record results) 14. Then places the daphnia into a new container of pond water 15. Repeat stages 8-14 with a new daphnia each time for each concentration, 0.06, 0.04, 0.02. 16. Test each concentration 3 times. 17.

  1. Marked by a teacher

    In this experiment we are trying to find out how the concentration of caffeine ...

    3 star(s)

    Caffeine is used in prescriptions for some disorders to increase circulation. When taken in large amounts it can cause loss of sleep and headache. This graph shows the over all average results from both trials one and two. It shows how the three levels of caffeine tested, affected the overall heart rate of the daphnia tested in this experiment.

  2. An investigation into how alcohol and caffeine affect the heart.

    At the strongest concentration of alcohol, the heartrate slowed by 54%. The strongest concentration of caffeine resulted in the heartrate increasing by 50%. The c2 statistical test used to analyse the results confirmed that both chemicals had a `very highly significant` effect on the daphnia's heart.

  1. The Effect of Caffeine on the Heart Rate of Daphnia.

    I then had 30 seconds to transfer the daphnia to a depression slide and cover it with a cover slip before counting the heart beat for 20 seconds using a clicker counter and multiplying by 3 to obtain a result in bpm.

  2. INVESTIGTING THE EFFECT OF CAFFEINE CONCENTRATION ON

    * 50 mg Caffeine tablets as this is the independent variable (will be constantly changing) * Cotton wool to place the Daphnia on when viewed under the microscope as it will make the Daphnia more stable so it is easier to view them under the microscope.

  1. Does caffeine affect heart rate?

    Use filter paper to suck water from the cavity slide. 8. Use a different pipette to transfer 5 drops of 0.1% caffeine to the cavity slide with Daphnia. 9. Adjust the microscope and meanwhile allow 3 minutes for caffeine to diffuse into the Daphnia 10.

  2. The effect of caffeine concentration on the heart rate of Daphnia.

    Once a particular Daphnia had had three readings taken from it a change was made to another Daphnia and the ice water replaced. Three readings per Daphnia were taken and five Daphnia per concentration were used. This served two purposes.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work