Transport System in Organisms (1)

Diffusion process

The method used to carry substance into and out from the cells

Oxygen

Needed by every cell for cell respiration

Nutrient

Needed by the cell to obtain energy

Carbon dioxide and other waste products

Need to be eliminated by the cells to the external environment

Simple organisms

Unicellular organisms

Do not have a specialised transport system

Cell membrane

Substances needed and waste products will pass through the cell membrane

Example of complex organisms

Humans, vertebrates and multicellular plants

Complex organisms

Organisms with multisel

Example of simple organisms

Amoeba sp., Paramecium sp., and Euglena sp.