Physical lines of defense include
skin, cielia, and mucous membranes
hair
nails
teeth
sweat and oil glands
tears
stomach acid
cilia in the respiratory tract
urine production
immune cells such as macrophages and neutrophils.
skin, cielia, and mucous membranes
hair
nails
teeth
tears
stomach acid
cilia in the respiratory tract
urine production
immune cells such as macrophages and neutrophils.