The adaptive (specific) defense system ________
A) is an innate defense
B) issues an attack specific to particular foreign substances
C) includes the skin and mucous membranes
D) is the body's first line of defense against invading pathogens
E) provides mechanical barriers to the body
B
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Some researchers think pheromones are important tools in human communication. Pheromones are chemical signals that one individual sends to another
What research questions might be asked by anatomists, and what questions might be asked by physiologists, to determine if pheromones are important to humans?
The keratinocytes are tightly connected with each other by
A) keratin. B) prekeratin. C) collagen fibers. D) elastic fibers. E) desmosomes.
Which of the following is another term for mitral valve?
A. tricuspid. B. aortic. C. pulmonary semilunar. D. bicuspid.
Where do most RBCs die?
A) Lymph nodes and thymus B) Spleen and liver C) Stomach and liver D) Red bone marrow E) Stomach and small intestine