• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10

My investigation is to find out whether consuming caffeine affects the body and, if so, in what way. In order to find out I am going to set up an experiment.

Extracts from this document...

Introduction

SC1 Aim My investigation is to find out whether consuming caffeine affects the body and, if so, in what way. In order to find out I am going to set up an experiment. Background, research and Theory Caffeine is the ingredient that gives coffee, tea, chocolate and Coca cola (Coke) its kick. It is called a stimulant because it causes a number of physiological effects. Stimulants are drugs which speed up the action of the brain. Caffeine affects the central nervous system and tends to stimulate the release of two key hormones - *epinephrine and norepinephrine. *(Norepinephrine and epinephrine are sometimes called noradrenalin and adrenaline) To understand this I will explain how nerve impulses are transmitted from cell to cell. Passage of nervous impulses from cell to cell Interchange of information involves impulses crossing the small spaces between the nerve endings. These spaces are called synapses. The transfer of impulses across these synapses involves the release of a "transmitter" chemical from one nerve cell, which then quickly diffuses to the next nerve cell in the chain. There are several such neurotransmitter substances. Caffeine belongs to the xanthine chemical group. Adenosine is a naturally occurring xanthine in the brain that is used as a neurotransmitter at some synapses. One effect of caffeine is to interfere with adenosine at multiple sites in the brain. ...read more.

Middle

I propose to do each of the tests at least three times and take an average. I will record the results of my pulse and then plot a graph. The coke gave us unreliable results so we decided to consume another substance in this case it was coffee. Firstly I took my resting pulse rate and recorded it on my results table. For this test my partner in the investigation measured out 150ml of hot water, 10ml of milk and 1.5g of coffee granules and poured it in a polystyrene cup. My partner has to do this because activity can disturb the results. Make sure the temperature of the coffee is at 55�c and remains exactly at this temperature for all the tests. Drink the coffee in 25 seconds as changing the time could affect the results so we will try and control temperature and time consumption. After consumption of the coffee take your heart rate and do the reaction time test which was the ruler drop and record it down on the results table after two minutes repeat as before. Record heart rate and ruler drop and keep doing this for every two minutes until 10 minutes. THINGS I NEED TO DO TO MAKE IT A FAIR TEST: 1.) Measure the amounts of coke accurately by using a measuring cylinder of an appropriate size. ...read more.

Conclusion

The pressure of getting the readings and results done in a set time can increase stress and increase adrenalin levels which would increase heart rate. I may have got better at catching the ruler or anticipating when my colleague was going to release it. The measuring of the point on the ruler where I caught it is not really very accurate. A better way to measure reaction times would be by some sort of electronic device such as pressing a button when you see or hear something. There may have been slightly too much or too little coke or coffee in the experiment. To have made the measurements even more accurate I could have used a burette because it would have given a much more precise measurement. Because of the constraints of time it was not possible to take all the readings in the same lesson period. The varying presence of food in my stomach could alter the absorption of the caffeine into the blood stream. Milk can slow down the absorption of the caffeine because the fat in it will slow down digestion. Taking all these factors into account the results obtained gave a satisfactory connection between pulse rate and amount of caffeine consumed when we used coffee but not when we used coke. It may have been that we did not drink enough coke for it to be effective, and if we had repeated the experiment with a larger volume of say 250mls we may have had more conclusive 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. Stem Cell Research

    The obvious difference is the difference in the variety of specialised cells that each can form. Embryonic stem cells can form any specialised cell in the human body; however adult stem cells are limited to forming only the cells of the tissue that they are in.

  2. The aim of the experiment is to find out the effect exercise has on ...

    If an unfit person was to exercise intensely for ten minutes their heart rate will increase and they will not get enough oxygen to their muscles so they will build up oxygen debt. This is because their muscles are respiring anareobically and producing lactic acid.

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

    As the concentration of the depressant increases, so does the affect that it has on the daphnia. Introduction Abstract The aim of this experiment was to study the effects of alcohol and caffeine on the heart, using a daphnia as the test subject.

  2. Daphnia Investigation

    In order for it to work though I would only have to change one thing at a time. If I were to change more than that it would make my results wrong. These are the variables that are in my experiment: * The first of the variables is the amount of the drug that we use.

  1. Should you vaccinate using the HPV vaccine?

    have the medical equipment for doing pap tests or have the knowledge of how to prevent or what the cancer concerns in the first place. On the other hand it shows more developed countries for instance Canada, Australia and France have a scarce amount, this could be because they have

  2. human body system

    This runs down the centre of the penis. This happens when blood is pumped into special spongy tissue in the penis. During an ejaculation semen is pumped out of the penis. This is due to the contraction of the muscles around the sperm tubes and urethra. Each ejaculation makes about a teaspoon of semen but this can contain 500 million sperms.

  1. INVESTIGTING THE EFFECT OF CAFFEINE CONCENTRATION ON

    A stopclock will be much more accurate to use than wrist-watch as it can be ensured that the clock is stopped at the right time. Also if it is stopped late the extra seconds or milli seconds can also be recorded.

  2. The aim of my investigation is to measure the effects of BMI (body mass ...

    Not all variables can be controlled throughout the experiment. I will not be able to control the temperature of the day (which may alter recovery time as mentioned in the introduction) and the weights of the test subjects. Another issue is that some individuals may not push to their physical forces when running the 100m.

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