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

Does Caffeine affect Heart Rate?

Extracts from this document...

Introduction

Does Caffeine affect Heart Rate? Summary In this experiment I investigated if caffeine affect heart rate. I took 4 different concentration on caffeine and gave me to daphnia (water flea). I measured the heart rate of theses water flea and found out that caffeine does affect heart rate in daphnia and also the higher the concentration of caffeine the greater the increase in heart rate. Introduction Hypothesis: The more caffeine add to the Daphnia the quicker the heart rate will be. Caffeine is a natural product produce in leafs and seeds of plants as an insecticide. Caffeine is medically know as trimethylzanthine and in pure form is a white crystalline powder. However the main way to consume caffeine is through drinks such as coffee and tea which are see as "pick me up" drinks and also cola, all have caffeine in them. Caffeine is also used in medicines in aspirin preparations and is also found in weight-loss drugs and also other drinks to keep you a wake such a red bull or pro-plus. Caffeine acts as a stimulant drug. ...read more.

Middle

The recommend daily alconce by doctors is 100mg of caffeine but as you can see you could quite easy go over that limit by just have a 5 ounces of coffee. Method Equipment list * Culture of Daphnia (water fleas) * Cavity slides * Dropping pipettes * Distilled water * Caffeine tablets * Cotton wool * Standard glassware ( breaker, measuring cylinders, etc) * Stopwatch * Paper towels or filter paper * Microscope Procedure 1. Gather all equipment on list 2. Make a standard solution of 50 ml of 0.1% of caffeine. 3. Mix 8ml of caffeine solution with 2 ml of distilled water in a beaker (label 0.08%) 4. Mix 6ml of caffeine solution with 4 ml of distilled water in a beaker (label 0.06%) 5. Mix 4 ml of caffeine solution with 6 ml of distilled water in a beaker (label 0.04%) 6. Mix 2 ml of caffeine solution with 8 ml of distilled water in a beaker (label 0.02%) ...read more.

Conclusion

This results therefore show that if a human would consume caffeine then there heart rate would increase. The results support my hypothesis that caffeine does increase heart rate. My conclusion is that caffeine does increase heart rate and this is shown from my data I have collected. However if only small amounts of caffeine are comsumed there will not be an advivest effect on the body or a persons health. Doctors recommend that no more than 100mg of caffeine should be consumed daily. This is so that the concentration of the drug is not to high in the body to have a dangerous affect and this is also shown in my data. This is shown because as the concentration increase so does heart rate. Therefore the increase concentration of the drug in the body could increase other side effects. I believe that my results are reliable and can be used as valid data. This is due to the fact I keep to my plan and control the indenptent variables well. The temperature was kept at room temperature. Also light was keep at the same level and the heart rate were measure under a controlled situations. ?? ?? ?? ?? ...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

Here's what a teacher thought of this essay

3 star(s)

This is a well researched report that covers the required aspects.
1. The background knowledge needs to be referenced.
2. The procedure is well detailed.
3. The results table is well presented.
4. The conclusion is well justified.
5. The report is missing an evaluation.
***

Marked by teacher Luke Smithen 05/07/2013

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

    Design an Experiment to show how exercise can affect Heart Rate in Humans.

    4 star(s)

    Therefore this also creates an increase in heart rate. The cardiac output is the amount of blood pumped out of the left side of the heart in one minute. This would therefore increase during exercise. Cardiac output is the product of stroke volume and heart rate. Therefore stroke volume also increases during exercise, this is the volume of blood pumped out of the heart at each beat.

  2. Marked by a teacher

    The effect of different sugar substrates on the rate of yeast respiration

    4 star(s)

    Below is its structure Lactose Lactose is a disaccharide which consists of a glucose and Galactose molecule. It is found in mammalian milk, where it helps in giving energy to the newborn infant. The shapes of these sugars are important in my investigation as they will determine which sugar produces the highest rate of respiration in yeast.

  1. Marked by a teacher

    How Does Lifestyle Affect the Circulatory System?

    3 star(s)

    It is generally not a person's lifestyle that causes this defect as it's a genetic disorder. It causes chest pain, shortness of breath, heart palpitations, fainting, and anxiety or panic attacks but rarely death. The opposite to mistral valve prolapsed is mistral valve stenosis.

  2. An experiment to investigate the rate of anaerobic respiration of yeast in various respiratory ...

    Respiration may completely stop due to the denaturation of all the enzymes associated with breaking down respiratory substrate. I have used a higher proportion of respiratory substrate in comparison to yeast because in order for the yeast to respire at an optimum rate throughout the experiment there must be excess substrate present.

  1. To investigate how the heart rate and breathing rate increase with exercise.Scientific KnowledgeAerobic respiration ...

    BR Av. HR 6 19.5 67 8 24 67.5 12 25.5 76.5 20 27 87 30 31.5 96 60 37.5 132 Av. Resting BR (Breaths Per Min) 18 Av. Resting HR (Beats Per Min) 63.5 Conclusion From my results it is obvious that there is a strong positive relationship between breathing rate, heart rate and exercise.

  2. Human biology short notes

    Food reaching the stomach is churned by muscles * Pepsinogen is secreted inactive form to prevent self-digestion * Pepsinogen is activated by HCl * Enzyme pepsin acts on proteins * Peptide bonds of proteins are broken down to peptides (Enzyme rennin digests proteins in babies)

  1. How does exercise affect your heart rate?

    * I will then record my results. * I will check my current heart rate every minute until it returns to its resting heart rate. * Once my heart rate has returned to its normal heart rate I will repeat the exercise and the steps above twice more waiting in

  2. Experiment to Investigate Factors Affecting the Rate of Respiration in Yeast

    This was so there was some water to be displaced by the CO2. Then I carried out the following experiments: 20?C, 30?C, 40?C, 50?C and 60?C. Each time I finished an experiment, I changed the water in the beaker, washed out the test tube thoroughly and boiled some new water.

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