mechanism of transportation in unicellular organismsIn unicellular organisms, the continuous streaming movements of the cytoplasm circulate materials within one-cell body. In Amoeba for example, which changes its shape as it moves, the cytoplasm streams from the rear to the front of the organism along the direction of its movement.

In paramecium, another unicellular organism which do not change its shape, the continuous circular movement of the cytoplasm brings about the distribution of materials such as food, oxygen, and carbon dioxide within its body.

Blood vessels transport system

There are different types of blood vessels
in the body. You know that during
inhalation a fresh supply of oxygen fills
the lungs. Oxygen has to be transported
to the rest of the body.
Also, the blood picks up the waste
materials including carbon dioxide from
the cells. This blood has to go back to
the heart for transport to the lungs for
removal of carbon dioxide

mechanism of transportation in simple multicellular organisms


hydra is a two layered body organism enclosed in a huge gut cavity. Movements of the gut wall draw water into the gut and cause digested food and oxygen within it to circulate.

This enables the cell lining the gut to absorb the materials. Some cells in the gut have flagellae.
The whipping movement of the flagellae also help to circulate the materials in the gut.


: flatworms, e.g. tapeworm, has a thin and flat body so that the surface area to volume ratio is large. In addition, the gut branches extend throughout the body. These features enable sufficient food and oxygen to diffuse into all the body cells. A branched excretory system is present to collect and get rid of waste products from the body. As in hydra, movements of the body wall aid the transportation of waste product out of its body.


insects and Molluscs have open circulatory system which helps to transport materials within the body. In the system, the heart pumps blood out into a blood vessel which branches and opens into spaces in the body cavity called heamocoels. The organs and tissues are bathed in blood, and exchange of materials occur between the body cells and the blood. Blood in the spaces eventually flows into vessels leading to the heart. Valves in the heart and blood vessels only allow the blood to flow in one direction. In this system, the distribution of blood to the various body parts is poorly controlled.


Veins are the vessels which carry carbon dioxide-rich blood from all parts of the body back to the heart. The veins
have thin walls. There are valves present in veins which allow blood to flow only towards the heart.
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Important topics related to the above article
1. Recognizing living things
2. Biology as an enquiry in science
3. Branches of biology
4. Processes of methods of science
5. Usefulness of science
6. Living and non-living things
7. Characteristics of living things
8. Differences between plants and animals
9. Organization of life
10. Complexity of organization in higher organisms
11. Kingdom monera
12. Kingdom Protista
13. Kingdom fungi
14. Kingdom Plantae
15. Kingdom Animalia
16. Cell as a living unit of an organism
17. Form in which living cells exist
18. Structures of plants and animal cells and functions of their components
19. Similarity and differences between plant and animal cell
20. Diffusion
21. Osmosis
22. Plasmolysis
23. Haemolysis
24. Turgidity
25. Faccidity
26. Nutrition
27. Feeding
28. Cellular respiration

the Heart transport system

The heart is an organ which beats continuously to act as a pump for the transport of blood, which carries other substances with it. Imagine a pump working for years without stopping! Absolutely impossible. Yet our heart works like a pump non-stop. Let us now learn about the heart.
The heart is located in the chest cavity with its lower tip slightly tilted towards the left
29. Excretion
30. Growth
31. Cell reaction to its environment
types vertebrae and the vertebral column
32. Movement and responses
33. Reproduction
34. Skeleton
35. Type of skeleton
36. Bones of axial and appendicular skeleton
37. Joint
38. Functions of skeleton in man
39. Supporting tissues in plants
40. Mechanisms of supports in plants
41. Uses of fibres to plants
42. Functions of supporting tissues in plants
43. test for Food substances
44. Balanced diet and kwashiokor
food tests
45. Modes of nutrition
46. Feeding mechanisms in holozoic organisms
maintenance of teeth gum
47. Mammalian teeth
48. Dentition
49. Digestive enzymes
50. Meaning of ecology
causes of germs and diseases in humans
51. Local biotic communities or biomes in Nigeria
52. Major biomes of the world
53. Population studies
54. Ecological factors

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