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Exchange and Transport in Protozoa

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Introduction

Exchange and Transport in Protozoa The exchange of gases between the environment and cells occurs via the process of diffusion. Diffusion depends on: * The amount of surface area available for diffusion. The larger the surface area the greater the rate of diffusion. * The concentration gradient. An organism which respires very quickly will have a much lower concentration of oxygen in the cells and a higher than normal concentration of Carbon Dioxide. So the greater the concentration gradient across the respiratory surface the quicker the rate of diffusion. ...read more.

Middle

For single celled/unicellular organisms the surface area to volume ratio is large, however, for larger organisms the surface area to volume ratio decreases. The larger the object gets the more complicated it gets. 1cm 1cm 2cm 1cm 3cm 2cm 2cm 3cm 3cm Surface Area= 6cm2 24cm2 54cm2 Volume= 1cm3 8cm3 27cm3 SA:V= 6:1 3:1 2:1 As this diagram illustrates that the smaller the object the larger the surface area to volume ratio. This is where single celled organism have an advantage. Organisms like Amoeba can exchange gases with environment quickly and easily. ...read more.

Conclusion

The contractile vacuole in this amoeba is used for water regulation. The excess water, which is collected in the cell, is expelled to the outside environment that is very costly in terms of energy. The food vacuole contains ingested food. Pseudopods are flowing projections of cytoplasm allow movement, and enable food to be engulfed by phagocytes. Most single celled organisms are similar to amoeba in the sense that they are found in moist areas. They also have similar structures which consist of a or two nuclei, food vacuoles and contractile vacuoles. Exchange and Transport in Protozoa 20/0904 Ahmed Farooqi L6GW ...read more.

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