Susceptibility to severe microbial infections can be caused by the inability of neutrophils to respond to attracting molecules known as:
chemotaxins
hemolysins
ferritins
lysozyme
These immune cells kill by releasing molecules into virally infected cells or cancer cells that induce apoptosis (cell death):
macrophages
complement
dendritic cells
NK cells
Mast cells in the tissues release __________which dilates blood vessels, bringing more blood to the tissues that have become damaged or infected.
C-reactive protein
membrane attack complex
histamine
C5b
Once pathogens penetrate through physical and chemical barriers, innate immune protective responses encountered by the pathogens include:
Fever
Phagocytes including macrophages and neutrophils
Complement activation
All of the above
Normal flora like Lactobacillus found in the vagina provide protection against pathogens by:
Making reactive oxygen intermediates
Secreting antibiotics
Making toxins that kill pathogens
Producing acidic metabolic products that reduce the pH, inhibiting growth of pathogens
Which of the following characteristics best describes dendritic cells?
They release cytokines that increase the permeability of the blood vessels
Once they mature, they circulate in the bloodstream where they interact with antigens
They produce antibodies
They serve as a bridge between innate and adaptive immune responses, carrying antigens from the tissues to T cells in the lymph nodes