Formation of phagosomes in the cell is the result of :-

Options

A. Egestion of solid materials
B. Ingestion of liquid materials
C. Ingestion of solid materials
D. Egestion of liquid materials

Answer

### Step-by-Step Text Solution:

1. **Understanding Endocytosis**: The process of phagosome formation begins with endocytosis, which is the mechanism by which cells internalize substances from their external environment. The term "endo" means to enter, and "cytos" refers to the cell.

2. **Ingestion of Molecules**: When substances are taken into the cell, this process is referred to as ingestion. In the context of endocytosis, ingestion can involve both small and large molecules.

3. **Types of Endocytosis**:
- **Pinocytosis**: This is the process where liquid substances are ingested, leading to the formation of pinosomes.
- **Phagocytosis**: This is specifically the process where solid particles are ingested, resulting in the formation of phagosomes.

4. **Mechanism of Phagosome Formation**:
- When a solid particle enters the cell, the cell membrane extends towards the particle.
- A small portion of the membrane wraps around the solid particle.
- This wrapping leads to the membrane enclosing the particle, ultimately forming a phagosome.

5. **Phagosome Structure**: The phagosome is a vesicle that contains the ingested solid particle. It is formed by the engulfing action of the cell membrane.

6. **Repair Mechanism**: After the phagosome is formed, the cell membrane that was involved in the engulfing process can quickly repair itself, aided by the GERL system (Golgi apparatus, Endoplasmic reticulum, and Lysosomes).

7. **Examples of Phagocytosis**:
- This process is commonly observed in unicellular organisms like amoeba, which use phagocytosis to consume food.
- In multicellular organisms, certain white blood cells (like macrophages) utilize phagocytosis to engulf pathogens.

### Conclusion:
The formation of phagosomes in the cell is the result of **phagocytosis**, a specific type of endocytosis that involves the ingestion of solid particles.

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