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

Factors affecting heat loss from the body

Extracts from this document...


Factors affecting the rate of heat loss from the body I am being asked to carry out a practical investigation which considers the factors affecting heat loss from the body. The aim of this investigation is to look at the effect of size on temperature loss in warm-blooded animals. I am going to discover and learn more about the relationship between objects and the rate at which they loose heat. I will be using beakers in correspondence to animals during this investigation. I will also be applying my knowledge of homeostasis in correlation to what I discover. Homeostasis is the property of either an open system or a closed system, especially a living organism that regulates its internal environment so as to maintain a stable, constant condition. This need for constancy was recognised in the nineteenth century by Claude Bernard. He concluded: 'La fixité du milieu interieur est la condition de la vie libre.'1 Which means: 'The constancy of the internal environment is the condition of the free life.' The temperature of environments inhabited by living organisms ranges from 90°C in hot spring to -40°C in the Arctic. Most organisms, however, live in the narrow range of temperature 10-30°C. To survive, most animals need to exert some control over their body temperature. ...read more.


6. Immediately record the initial temperatures start the stop watch and secure the tops of each beaker tightly. (Consider elastic bands to secure the insulating cotton wool). 7. Take the temperature every 5minutes and record these. These results will used for analysis. 8. Continue taking the temperature 5 minutes for the next 30 minutes. Hypothesis The addition of insulation will reduce the rate of heat lost. The reason for this is that heat is lost in 4 main ways in these experiments; evapouration, conduction, convection and radiation. By the addition of cotton wool which I am using to simulate the insulation, I am preventing evapouration because the hot air can't escape, and I am preventing convection because there are no currents of air taking away the hot air. I also predict that the rate at which heat is lost will be reduced by more than half because the ways in which heat can be lost is eliminated by the addition of cotton wool as the insulation. Results Time (mins) 0 layers 1 layers 2 layers 3 layers 4 layers Initial 0 84°C 84°C 84°C 84°C 84°C 5 73°C 81°C 81°C 82°C 82°C 10 65°C 78°C 78°C 79°C 80°C 15 59°C 72°C 71°C 75°C 78°C 20 55°C 71°C 73°C 74°C 77°C 25 51°C 70°C 72°C 73°C 75°C 30 48°C 65°C 70°C 71°C 73°C Total temp. ...read more.


I imagine that the curves would have evened out into a straight line if I had of extended the duration of the experiment showing that heat loss had slowed right down to almost a halt. The beaker with 4 layers of insulation lost only 13% of the initial temperature and the beaker with no insulation lost on average 41% approx. First I obtained the result from taking the two results which I recorded for the 200ml beakers with no insulation and calculated the average. Variable 1 Variable 2 Initial starting temp. 84°C 89°C Total temp. Lost 36°C 42°C % Loss 43 46 So, 36 + 42/ 2 = 39°C total temp, lost. % lost = 43 + 46/2 = 41% I also hypothesised that with the use of cotton wool as an insulator, heat loss should be reduced by more than half. For this I was able calculate the percentage of heat loss that the cotton wool was able to prevent. 1. With 4 layers heat loss = 11°C No layers heat loss = 36°C 25°C difference, so, 25/84 x 100 = 29.8% prevention 2. With layers heat loss = 11°C No layers heat loss = 42°C 31°C difference, so, 31/89 x 100 = 34.8% prevention 3. 29.8 + 34.8/2 = 32.3% prevention from heat loss. It is therefore correct to say that the rate of heat loss decreases with time. ...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

    Biology Revision notes - Human Biology

    5 star(s)

    Our extremities are cooler. Animals which can keep their body temperature constant are said to be homoeothermic. They are usually warm-blooded mammals. If the body's temperature falls below 32, you develop hypothermia. Reactions in the body slow down because enzymes can't work properly.

  2. Human biology short notes

    * When Monocytes enter the blood they are referred to as macrophages Granulocytes * Basophlis and Eosinophils respond to allergic reaction/ reaction against parasite * Neutrophlis are the main phagocytes Phagocytosis * Phagocytes engulf bacteria * Release enzymes in the cytoplasm * Digest/destroy bacteria * Preventing the spread of pathogens 3.

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

    159 184 113 152 34 35 36 35 38 38 36 37 4 159 162 165 162 31 35 38 35 37 38 383 38 5 175 177 179 177 37 39 41 39 38 39 39 39 Patterns I took averages of my results as this would help with any mistakes, which may have happened during the experiment i.e.

  2. Investigate the nature of heat loss in the human body.

    Mechanisms Of Heat Transfer Maintaining body temperature depends on the ability to lose heat to the environment at the same rate as it is produced by metabolic reactions. Heat can be transferred from the body to its surroundings in four ways: conduction, convection, radiation and evaporation.

  1. Should you vaccinate using the HPV vaccine?

    if you do find something it is recommended to see your GP. 30 Females need a yearly Pap test, this will check for warts as well as pre-cancerous changes in the cervix or vagina. 30 What is a Pap test?

  2. HSC Module-Blueprint of Life

    It is single stranded, and instead of thymine, there is uracil. There are 3 forms involved in polypeptide synthesis: > mRNA: Messenger RNA carries the genetic code outside the nucleus, into the cytoplasm, where it can be read by

  1. human body system

    Pancreas produces the lot amylase, lipase and the protease. There are only three main digestive enzymes, which break down big molecules into smaller ones. Starch, protein and fats are big molecules, which can't pass through cell walls into the blood.

  2. Work related report

    These are basic details noted. All information describing the patient must be clear in order for the next nurse to be able to read it. This skill is not very important if information is to be stored on a computer.

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