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

To investigate the heart rate of Daphnia when added to certain liquids.

Extracts from this document...

Introduction

Jack Downes To investigate the heart rate of Daphnia when added to certain liquids. I will add ethanol to decrease the daphnia's heart rate and use red bull to increase the daphnia's heart rate. I will have to use many different daphnia, obviously, because if I don't the daphnia I use will already be contaminated. I predict that too much, Red bull or too much alcohol will kill the daphnia's. A daphnia is a see through water flea; these small fleas are food for small fish. The daphnia is see through but is too small to be seen by the naked eye, but when under a microscope you can see everything that is working in the daphnia. This is why we will be using daphnia for these experiments, they are seeing through and we can count the heartbeats. ...read more.

Middle

I will keep the room temperature the same, every time I carry out this experiment. I will have to use a different daphnia every time I add more ethanol or red bull. I am going to use five different concentration ranges from 10% down to 0.001% of each drug watered down. I will get concentration levels by: 1cm cubed of ethanol+9cm cubed of H20=10% of ethanol 1cm cubed of first solution+9cm cubed of H2 0=1% of ethanol and so on find 0.1%, 0.01% and 0.001% % Concentration Red Bull Test one Test two Test three 0 246 264 258 0.001% 318 318 300 0.01% 378 348 354 0.1% 470 486 462 1% 696 672 678 10% Dead Dead Dead Carried out the experiment by counting heart beats over 10 seconds and then worked out heart rate by multiplying them by 6. ...read more.

Conclusion

If I was to do this experiment again I think I would try and get all the practical done in one lesson because when you are working through only the pone lesson you are more unlikely too make a big mistake as you have been testing the whole hour but with spreading it over a few lessons I was more likely to change little things and make mistakes. I feel that over all my experiment went pretty well, there were no real big mistakes in my results. My conclusion is pretty correct I do believe my results would have been more interesting had I done them all in the same lesson. To improve this experiment I would make the dosages of both red bull and ethanol because I have no results for 10%, due to it being to strong for the little daphnia. ...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. Effect of Ethanol on the Daphnia heart rate

    Heat may modify the Daphnia heart rate, and the effect of heat on the heart rate is not the purpose of this experiment. 3. Now it is time to pick out one Daphnia from the glass or container where you put all of them in.

  2. Coursework on the heart rate of the daphnia

    o The lab temperature could also effect the investigation. o The minimum and maximum temperatures that a daphnia can live in will have to be decided.

  1. Investigating The Effect Of Drugs On the Heart Rate of a Daphnia.

    With the large pipette I will take my daphnia, which is in the fresh water and put it onto the slide. I will then absorb the fresh water and add the new solution, which is in the syringe. I will then time for three minutes while the slide is in

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

    A Table to show the Relationship between the Caffeine Concentration and the Average Heart Rate of a Daphnia Concentration of caffeine / % Number of heart beats of Daphnia per 10 secsonds Mean number heart rate per a minute 0.0 56 47 44 56 57 50 65 55 312 59

  1. To investigate the effects of a depressant on the heart rate of a daphnia.

    Its behavioural effects stem from its effects on the brain, rather than the muscles or senses. In high doses, the effects of ethanol on human's produces symptoms such as slurred speech, unsteady walk and inability to walk. This is commonly called being in a state of drunkenness or being drunk.

  2. Exercise has certain benefits on a person's health, and physical condition.

    An increase in the blood volume pumped from the heart would increase blood pressure & cause blood vessels to dilate. Blood pressure is measured as the systole & diastole pressures. Systole blood pressure (SBP) accounts for the pressure when the heart contracts (resulting in a heart beat), pumps blood into the aorta (the body's main artery)

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