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A-Level Biology OCR A

Cell Phagosome Contents Explain Paragraph Diagram Substances Move

During endocytosis, the cell membrane engulfs extracellular material, forming a vesicle (phagosome) that internalizes the contents; this vesicle may later fuse with a lysosome for degradation.

Endocytosis brings materials into the cell as the plasma membrane invaginates, surrounds the material, and forms a vesicle (phagosome), which can then fuse with a lysosome for digestion.

Front Explain in a paragraph with a diagram how substances can move into a cell by endocytosis. (use phagocytosis as example)
Back Endocytosis:
  • Solid binds to cell receptors

  • Plasma membrane invaginates, surrounding the extracellular material

  • Phagosome vesicle forms and pinches off, bringing contents inside the cell

  • Phagosome can then fuse with a lysosome forming a phagolysosome to digest the contents

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