level: 5.2 Phagocytosis
Questions and Answers List
level questions: 5.2 Phagocytosis
| Question | Answer |
|---|---|
| Phagocytes | - Type of white blood cell - Defence against pathogens that pass through the first line of defence |
| Phagocytosis | - Pathogens are engulfed into vesicles (phagosomes) and broken down by enzymes |
| Phagocytosis process (Stage 1) | - Phagocyte recognises foreign antigen on a pathogen |
| Phagocytosis (Stage 2) | - The cytoplasm of the phagocyte moves round the pathogen - Engulfing it |
| Phagocytosis (Stage 3) | - Pathogen now contained in phagocyte vacuole in cytoplasm (phagosome) |
| Phagocytosis (Stage 4) | - A lysosome fuses with the phagocyte vacuole - Lysozymes break down pathogen |
| Phagocytosis (Stage 5) | - Phagocyte sticks pathogen antigens on its surface to activate other immune system cells |