BRAINCAKEPhagocytosis
Large particles and bacteria can be engulfed by phagocytosis.
Phagocytes move in a particular direction down a chemical gradient. This is called chemotaxis and is caused by a chemoattractant being released in one location.
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Key terms in this lesson
- hydrolysis
- The breaking of a covalent bond within a molecule using a water molecule.
- lysosome
- A vesicle containing hydrolytic enzymes that breaks down waste material, old organelles and pathogens.
- pathogen
- A microorganism, such as a virus, bacterium, fungus or protoctist, that causes disease.
More in Cell Recognition and the Immune System
- The Immune System
- Defence Mechanisms
- Lymphocytes and Phagocytes
- Recognising Self and Non-Self Cells
- Antigens
- Lymphocytes
- Cell-Mediated Immunity
- Cytotoxic T-cells
All 30 lessons in Cell Recognition and the Immune System · All AQA AS-level Biology topics