• 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)

    To calculate an estimate for fluid requirements this should then be multiplied by 1.5. The following tips will assist with hydration: * Drink with all meals and snacks before a training session.

  2. Marked by a teacher

    Effect of nitrate concentration on the growth of Duckweeds

    5 star(s)

    Potassium is a cofactor that functions in protein synthesis, it also aids processes such as active transport and major solute functioning in water balance. The yellow colour obtained is because there was a shortage in chlorophylls which means that there is less light energy trapped due to fewer amounts of

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

    Therefore the activity of the lipase will also be due to the temperature at the start as the temperature will be different for each experiment. Consequently we will be seeing how bile salt concentration and temperature affect enzyme activity and not just how concentration of bile salts affects activity as we should.

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

    and repeat the procedure. Safety: - * Check the tides so that you do not get cut off by incoming tides. Preferably work on a falling tide. * Ensure the supervisor is carrying a first aid kit * Wear warm, waterproof clothing to avoid hypothermia.

  1. Investigating how prolonged exposure to its optimum temperature affects the respiration of yeast.

    for a few minutes prior, it needs time to reach that temperature before respiring properly. The graph for this set of results can be seen over the next page. The scatter diagram contains a line of best fit, which is useful when needing to predict the amount of Carbon Dioxide

  2. Why the Body Needs Energy? Every living cell within the ...

    A muscular layer called the tunica media, and then an outer layer called the tunica adventitia; this contains nerve cells and the blood vessels that supplying the vessel itself! The tunica adventitia actually contains more connective tissue than anything else, and has fibroblasts in it.

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

    The acinar and duct cells both from a continuous layer, which separates the interstitial space of the pancreas. This interstitial space is the space, which is in between the cells but outside the blood stream from the lumen of the gland.

  2. The Homeostatic Mechanisms

    The parasympathetic nervous system is active when a person is feeling relaxed. The sympathetic nervous system however, becomes active when a person is exercising, feeling stress or fear. It causes the heart to beat stronger and increases the heart rate.

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