Introduction
to Transport:
Transport accurately means “the movement of people, things
or whatever from one place to another place”. Similarly, in biology, transport means the movement
of nutrients into the cell and elimination of wastes from the cell. So,
materials move into, within and out of the body. Transport not only means the
movement of individual atoms or molecules but also their mass transport within
the body. There are various processes involved in transport. Diffusion,
osmosis, active transport, exocytosis, endocytosis, etc facilitate the process
of transportation. In animals, the materials move into, within and out of the
body, in respiratory, circulatory, digestive and excretory systems.
Need
For Transport of Materials:
The living organism is a complex of interactions of physical
and chemical reactions involving different elements and molecules. All living
cells or living organisms must obtain and transport certain materials within
the body and also transport and remove the wastes out of their bodies or cells.
If there were no transport systems, the desired nutrients would unable to reach
each and every cell of the body resulting in the death of the organism. There are no mass flow systems in
unicellular organisms and lower multicellular organisms.
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