Exchange and Transport in Protozoa

Exchange and Transport in Protozoa

Length: 429 words (1.2 double-spaced pages)

Rating: Excellent

Open Document

Essay Preview

More ↓
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.

· The thickness or length of the diffusion path. The greater the
thickness of the path the slower the rate of diffusion because the
gases will have to travel a larger distance. So the respiratory
surface must be as thin as possible.

The relation of the three points above can be summed up by Fick’s Law:

However, the amount of gas which an organism needs to exchange is
greatly proportional to its volume, nevertheless, the amount of
gaseous exchange which takes place is proportional to the surface area
over which the exchange happens.

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.

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. However exchange surfaces need to
attain certain properties to maximise gaseous exchange. They are:

· Need to have a good blood supply- high concentration gradient

· Moist- Dissolve gases

· Large Surface Area

· Thin walls

· Permeable

As single celled organisms are small so they do not have to have
specialised systems like much larger organisms like mammals. Single
celled organisms like amoeba do not have to have transport systems or
specialised systems because they are so small so [IMAGE]substances do
not have to travel far to get to their desired destination.

The contractile vacuole in this amoeba is used for water regulation.

How to Cite this Page

MLA Citation:
"Exchange and Transport in Protozoa." 15 Jul 2019

Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

Essay on Internal Transport and Gas Exchange

- ... The inferior vena cava is the vein that transports blood from the lower half of the body, or areas of the body that are below the diaphragm, into the heart (Clinic, 2014). The heart is split into two pumps that are located right next to each other. Each pump works a single blood circuit. The left side of the heart is the systemic circuit and the right side of the heart is the pulmonary circuit. The pulmonary circuit is the blood route that takes the blood from heart to the lungs. Once the exchange of gases is complete in the lungs, the blood is pumped out of the lungs into the left side of the heart....   [tags: blood, circulatory system, nutrients, oxygen]

Research Papers
1502 words (4.3 pages)

Public Transport, Road Transport And Bicycle Transport Essay

- Due to this increase in congestion, it is conceivable the forecast jobs may not materialise, or perhaps may be located elsewhere, and the productivity gains associated with increasing density would also not eventuate which would have a deleterious effect on the economy and Melbourne’s competitiveness as a whole. Alternatively, investments could be made to accommodate the increase in jobs in the Melbourne Inner area. Listed below are different potential scenarios for Melbourne to accommodate this job growth....   [tags: Automobile, Vehicle, Bus, Public transport]

Research Papers
722 words (2.1 pages)

The Problem Of Public Transport Essay

- Public transport become one of core topic while contributing a livable society. However, people tend to highly dependent on car, which is not only means of transport but also play an essential role in society such as sense of superiority and power (Steg, 2005). Accessibility tends to become the focus of transport planning (Morris, Dumble & Wigan, 1978). This essay will analysis the problems bought by shortage of public transport occurs in Mernda in terms of low accessible and higher car dependency....   [tags: Public transport, Bus, Sustainable transport]

Research Papers
1423 words (4.1 pages)

Essay on The Uk Public Transport Services

- Introduction: Arriva, which is owned by Deutsche Bahn, has been one of the UK’s biggest bus operants and play a great role in the country’s decontrol rail industry. According to HAYS (2015), Arriva is a leading pan-European public transport operator with around 54,500 employees and operations across 14 European countries. Having first entered the UK public transport market in 1980, Arriva has grown to provide key bus services across the UK and became the country 's second-biggest bus company in 1996....   [tags: Bus, Public transport, Transportation]

Research Papers
1399 words (4 pages)

Essay about History Of New York Stock Exchange

- History Of The New York Stock Exchange Nowadays the world 's main trading platform is considered to be the New York Stock Exchange (NYSE). Not only for the United States but also for the whole world of finance, it is the great and major exchange. In the history of its creation, an important date is 1792. The year when twenty four brokers in New York signed the Buttonwood Agreement on the establishment of a new stock exchange in order to be able to limit their commission fees . However, as we know it today The New York Stock Exchange begins its history in the year 1865 when it has acquired its own building with a white facade with six columns built in the Corinthian style ....   [tags: Stock exchange, Stock market, World War II]

Research Papers
1609 words (4.6 pages)

Essay about Transport Is A Pre Condition For Economic Growth

- Transport is a pre-condition for economic growth as it provides accessibility that shapes our lives and our cities. London has the best transport system in the world hosting connections and throughout its history the city’s growth has been predicated on and shaped by its transport system. It has long been well established and documented that the need for transport contributes effectively to sustainable development. The previous parliament commissioned the 2011 Local Transport White Paper (Creating Growth, Cutting Carbon) which made clear the importance of the relationship....   [tags: Sustainability, Public transport, Economics]

Research Papers
715 words (2 pages)

Questions On The Foreign Exchange Market Essay

- INTRODUCTION One of the fundamental topics in the foreign exchange market is to know how information is reflected in the determination of prices. This question is also true for any topics in financial economics but it is all the more important in the currencies market, which is the largest market in the world. The first searches about the correlation between the releases of macroeconomic data and the foreign exchange rate between two currencies were made in the early 1980s. Meese and Rogoff (1983) first try to demonstrate that exchange rates could not be explained by fundamentals....   [tags: Foreign exchange market, Exchange rate]

Research Papers
1307 words (3.7 pages)

Different Modes Of Transport For Specific Commodities Essay

- This paper aims at providing more information concerning the different modes of transport, their characteristics and also the comparison of these modes with one another in an effort to establish the best mode of transport for specific commodities. The paper also takes into consideration the various factors affecting the transport sector; such as cost of transportation, flexibility, time factor and reliability. Transport refers to the process that enables physical movement of goods and people from on area to another....   [tags: Transport, Transportation, Natural gas, Petroleum]

Research Papers
998 words (2.9 pages)

Notes On Foreign Exchange Market Essay

- Trevir Nath Top Forex Risks The foreign exchange market, forex for short, is the buying and selling of currencies around the world. Like stocks, the end goal of forex trading is to yield a net profit by buying low and selling high. Favorable for forex traders, they have the advantage of choosing a handful of currencies rather than parsing through thousands of companies and sectors. In terms of trading volume, forex trading are the largest markets in the world. Due to its high trading volume, forex assets are classified as highly liquid assets....   [tags: Foreign exchange market, Exchange rate]

Research Papers
716 words (2 pages)

Essay on Stock Exchange

- A Stock Exchange is an organized market for buying and selling financial instruments known as securities, which include stocks, bonds, options, and futures. Most stock exchanges have specific locations where the trades are completed. For the stock of a company to be traded at these exchanges, it must be listed, and to be listed, the company must satisfy certain requirements. But not all stocks are bought and sold at a specific site. Such stocks are referred to as unlisted. Many of these stocks are traded over the counter—that is, by telephone or by computer....   [tags: Stock Exchange Market Research Paper]

Free Essays
819 words (2.3 pages)

Related Searches

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.
Return to