BRIEF INTRODUCTION TO TRANSPORT

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.