Physical lines of defense include
skin, cielia, and mucous membranes.
hair.
nails.
teeth.
sweat and sebaceous glands.
stomach acid.
coughing and sneezing reflexes.
white blood cells.
inflammation response.
skin, cielia, and mucous membranes.
hair.
nails.
teeth.
stomach acid.
coughing and sneezing reflexes.
white blood cells.
inflammation response.