Respond to statements 99–103 with reference to the organ
systems listed below.
a. circulatory
b. lymphatic
c. digestive
d. endocrine
e. respiratory
E 99. the first line of defense against infectious bacteria
found in food
E 100. involved in the immune response
M 101. initially encounters airborne pathogens
E 102. distributes antibodies throughout the body
E 103. recovers excess tissue fluid
Answers: 99. c, 100. b, 101. e, 102. a, 103. b
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