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Answer :
Diapedesis is characterized by its occurrence in capillaries, allowing leukocytes to pass through vessel walls into tissues. This process is vital for immune responses as it increases phagocytosis and enables leukocytes to reach infected areas.
Diapedesis is a process whereby leukocytes (white blood cells) squeeze through the walls of small blood vessels to enter tissues, primarily to fight infections. Out of the given options, a characteristic of diapedesis is that it can only occur in capillaries. This is because capillaries are the smallest blood vessels where leukocytes can pass through the vessel walls into tissue spaces to reach sites of infection or injury.
Here are some key benefits of diapedesis:
- Increased phagocytosis: Diapedesis allows phagocytic leukocytes like neutrophils and macrophages to reach and eliminate pathogens efficiently.
- Activation of phagocytes by inflammatory mediators enhances their ability to adhere to capillary walls and move into tissues.
- The process is regulated by cytokines and cellular adhesion molecules which help leukocytes navigate towards infection sites.
Thus, a crucial feature of diapedesis is its occurrence in capillaries, facilitating immune responses.
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