What is the process by which cells engulf solid particles?

What is the process by which cells engulf solid particles?

• A. Pinocytosis
• B. Exocytosis
• C. Phagocytosis
• D. Transcytosis

Answer: (C)

Phagocytosis is the process by which cells engulf solid particles. This is a critical mechanism utilized by certain cells, particularly immune cells like macrophages and neutrophils, to capture and eliminate foreign particles, bacteria, or dead cells. During phagocytosis, the cell membrane extends around the solid particles, eventually enclosing them and forming a phagosome, which can then fuse with lysosomes for digestion and destruction of the engulfed material. This process is essential for maintaining tissue homeostasis and defending against pathogens, showcasing the role of phagocytosis in the immune response and cellular cleanup. In contrast, pinocytosis refers to the uptake of liquid substances into the cell, exocytosis is the process of vesicles fusing with the plasma membrane to release their contents outside the cell, and transcytosis involves the transport of materials across the interior of a cell, typically from one side to the other. Therefore, phagocytosis specifically is the only process that focuses on the engulfment of solid particles.

Phagocytosis is the process by which cells engulf solid particles. This is a critical mechanism utilized by certain cells, particularly immune cells like macrophages and neutrophils, to capture and eliminate foreign particles, bacteria, or dead cells. During phagocytosis, the cell membrane extends around the solid particles, eventually enclosing them and forming a phagosome, which can then fuse with lysosomes for digestion and destruction of the engulfed material. This process is essential for maintaining tissue homeostasis and defending against pathogens, showcasing the role of phagocytosis in the immune response and cellular cleanup.

In contrast, pinocytosis refers to the uptake of liquid substances into the cell, exocytosis is the process of vesicles fusing with the plasma membrane to release their contents outside the cell, and transcytosis involves the transport of materials across the interior of a cell, typically from one side to the other. Therefore, phagocytosis specifically is the only process that focuses on the engulfment of solid particles.