Skin forms a physical barrier to pathogens

T cells regognize specific antigens and cause cell lysis

Macrophages engulf bacterial cells at the site of infection

The body produces large numbers of memory cells with specific antibodies

plasma cells

phagocytic cells

helper T cells

antibodies

innate immunity

adaptive immunity

nonspecific immunity

normal microbiota

skin

B cells

sweat

lysozyme

Is always working and doesn't require any special preparation

Needs to be "primed" before it can work to its full effectiveness

Is very specific and only defends against a specific pathogen

provides a better response the second time a microbe is encountered