AP BIOLOGY

Detailed explanation-1: -Polymorphonuclear neutrophils (PMNs) are the most abundant leukocytes in the circulation, and the first cellular responders to tissue injury and infection.

Detailed explanation-2: -Neutrophils are first responders of the immune system, rapidly migrating into affected tissues in response to injury or infection.

Detailed explanation-3: -Neutrophils are the first cells to reach the site of infection, attracted by chemotactic factors such as complement, with their predominant role being phagocytosis.

Detailed explanation-4: -A type of white blood cell that is an important part of the immune system and helps the body fight infection. When microorganisms, such as bacteria or viruses, enter the body, neutrophils are one of the first immune cells to respond.

Detailed explanation-5: -Neutrophils are important effector cells in the innate arm of the immune system (Mayadas et al., 2014). They constantly patrol the organism for signs of microbial infections, and when found, these cells quickly respond to trap and kill the invading pathogens.