What term describes leukocytes passing through capillary pores into body tissues?

The term that describes leukocytes passing through capillary pores into body tissues is diapedesis. This is a crucial process during inflammation and immune response, allowing white blood cells to exit the bloodstream and migrate towards sites of infection or injury in the tissues.

Diapedesis involves the leukocytes altering their shape to fit through the narrow openings in the capillary walls. This active movement is facilitated by various signaling molecules that attract the leukocytes to the affected area, allowing them to respond efficiently to pathogens or cellular damage.

In contrast to diapedesis, exocytosis refers to the process where cells expel materials in vesicles, chemotaxis is the movement of organisms or cells towards or away from a chemical stimulus, and phagocytosis is the process by which certain cells engulf and digest particles, such as pathogens or cellular debris. Each of these terms describes different cellular activities, highlighting the specificity and importance of diapedesis in the context of the immune system and its function in tissue sampling and response.