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

The Importance of Being The Right Size.

Extracts from this document...

Introduction

The Importance of Being The Right Size 'The higher organisms are not larger than the lower because they are more complicated. They are more complicated because they are larger.' Hyung-woo (Shane) Cho L6GW Most people will be most likely to believe that the higher organisms, such as, animals, are larger because they are more complicated. However, actually, the higher organisms are complicated because they are larger. In other words, they have to be complicated in order to be large. Then why do they have to be complicated? And why do they want to get bigger? Simply, the higher organisms are more complicated because they need more organisms and support from their body itself, to keep their large sized body. All the living things have their own features to adapt their living habitats. Complicated mechanisms and large sized body are included in these features as well. The feature that is linked with the size of a living organism is surface area and the gas exchange. To get the energy to continue their lives organisms need to do respiration. Gaseous exchange is necessary for this, for respiration oxygen is taken into their body, and carbon dioxide are released out to the atmosphere. ...read more.

Middle

A thin, flat shape, such as that of the leaves of plants; the fronds of seaweed; or the body of a flatworm, have a large surface area-to-volume ratio and therefore their gas exchange is potentially extremely efficient. Flat shape also increases the surface area, the protozoan such as flatworm has a flat shape so that all the cells will be exposed and get enough oxygen. Tube shape also increases surface area as well, which helps to increase the rate of gas diffusion. This is why organisms like earthworms are able to respire through their skins. Shape 1 x 1 x 1 2 x 2 x 2 20 x 1 x 0.5 (flat, eg leave) 40 x 0.5 x 0.5 (tube shaped, eg earthworm) Surface Area 6 cm� 24 cm� 61 cm� 80.5 cm� Volume 1 cm� 8 cm� 10 cm� 10 cm� SA : Vol. 6 : 1 3 : 1 6.1 : 1 8.05 : 1 Many larger organisms have specialized sites of exchange, as they want to satisfy the demand of oxygen. The lung specialized organ for animals such as human. ...read more.

Conclusion

The higher organisms can avoid being eaten, eat more things, move longer distances to new food sources or more favourable environment, and reduce heat loss, if they have larger body. Larger body is suitable for keeping temperature, because if they have small body, it will have more surface area that will cause more heat loss from the surface. Small organisms such as amoeba does not need organs such as lungs because it is very small, therefore it has larger surface area compared to its volume, so that it can respire through its surface. Organisms such as leaves of a plant, flatworm, and earthworm have flat or tube shape, which is also a way to increase the surface area to allow more diffusion of gas. Bigger organisms get more complicated because they need more organs and mechanisms to support their body. They need much amount of gas exchange, and because their surface area is less compared to their volume, they need specialized sites for exchange, e.g. lungs and roots. Higher organisms also have good transport system to produce good diffusion gradient for allowing more gas exchange. Also, some organisms which are very heavy, have got much thicker legs to enable themselves to support their body. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Energy, Respiration & the Environment 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 AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Home Economics - Why is nutrition important to sports people?

    5 star(s)

    carried out, the information needs to be used to answer the title. In this section, I shall use the knowledge gained in the analysis section to assess how the task title can be answered and conclude what needs to be planned to execute this.

  2. Marked by a teacher

    Effect of nitrate concentration on the growth of Duckweeds

    5 star(s)

    The alternative hypotheses can only be accepted if we are 95% or more sure that the null hypothesis is not correct. The standard deviation formula used is The standard deviation of 0% = 6.58 0.4% = 7.67 0.8% = 4.91 1.2% = 3.00 1.6% = 2.56 2% = 1.57 Looking

  1. Marked by a teacher

    Investigation on the size of Limpets.

    5 star(s)

    Larger limpets have a lower surface area : body volume ratio thereby reducing the rate of water loss. Species living at the bottom of the shore (sublittoral zone) such as the Patella aspera haven't adapted in this manner, as

  2. Marked by a teacher

    A comparative study of the density of patella vulgata (common limpet) across a sheltered ...

    4 star(s)

    When looking from the meter ruler you should see a point that is level with your eye and the ruler, you make a note of this point, and then do the same procedure again from that point. You will have to do this three times and the fourth time you

  1. the effect of bile concentration on the activity of the enzyme lipase during the ...

    to my background information as by increasing the concentration of bile salts the more lipid molecules will be emulsified, providing a bigger surface area for lipase to work on increasing its activity and the rate of reaction. However for this particular concentration it does not seem to follow this trend

  2. The Pancreas is a large gland that forms part of the Endocrine System, but ...

    ** Use of water bath is to keep the temperature constant at 37OC. **Modification 2: I chose to use the water bath (again set at 37OC) as it provides a constant temperature for the enzymes to work in.

  1. A Comparative Study of the Density of Patella Vulgata (Common Limpets) in the Optimum ...

    The moon is responsible for creating waves. The gravity from the moon is responsible for the tidal bulges (oceans bulging out at the same time which result in high tides). Due to the earth rotating on its axis, the tidal bulges move back and forth causing high and low tides.

  2. The Homeostatic Mechanisms

    Its nerves are the cardiac nerves and are powered by adrenaline when a person is in a fight, flight or fright situation. This is to overtake the homeostatic control of glucose, in order for the breakdown of glycogen into glucose to take place so that it can be used for energy to either fight, or flee from the situation.

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