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Transcript
Aim: How does transport occur in lower organisms? I. Transport – the life function by which substances are absorbed, circulated, and released by living things. A. Absorption – the first stage of transport. 1. It is the process by which cells take dissolved materials and through the plasma membrane into the cells interior. 2. The materials that may be absorbed are the end products of digestion, dissolved gases, salts and other materials necessary for life. B. Circulation – the second stage of transport. 1. When absorbed materials are moved from one area to another within an organism. 2. Materials may be moved by diffusion, and in more complex organisms, a vascular system is needed. II. Transport in the Ameba and the Paramecium A. Since these organisms are unicellular, materials just circulate throughout the cell. 1. Cyclosis – the fluid of the cell circulates. Also known as cytoplasmic streaming. II. Transport in the Hydra A. Has two cell layers in which every cell is in direct contact with its environment. 1. Thus, it does not need a circulatory system. Materials are absorbed by diffusion from cell to cell.