Pinocytosis

Pinocytosis is the engulfing of small particles or fluids by the cell. That is, when these substances meet the cell membrane, they cause the membrane to form a channel. At the end of this channel, small vesicles form. These vesicles contain the substance and some extracellular fluid. The vesicle then breaks away from the rest of the membrane and migrates toward the center of the cell. Figure 2-3 illustrates the process of pinocytosis.

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Figure 2-3. Pinocytosis.

1. Particles contact cell membrane.

2. Vesicle (saclike structure) is formed.

3. Vesicle containing the particles passes into the cell.

1. Particles contact cell membrane.

2. Vesicle (saclike structure) is formed.

3. Vesicle containing the particles passes into the cell.

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