Phagocytes: Neutrophils and Macrophages
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Phagocytic leukocytes, chiefly neutrophils and macrophages, engulf and digest pathogens directly once a barrier is breached, forming the innate response's first internal line of defense.
Show
Macrophages also release signaling molecules that recruit additional immune cells to an infection site.
Watch for
Phagocytes act nonspecifically against pathogens generally, unlike the antigen-specific cells covered later in this chapter's adaptive-immunity section.