The __________ circuit carries blood from the heart to body tissues, and then returns it to the heart.
Fill in the blank(s) with the appropriate word(s).
systemic
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In the above figure, which letter points to the oviduct?
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Which cells are held in reserve to be used for a rapid response to subsequent intruders of the same type?
a. NK cells b. helper T cells c. cytotoxic T cells d. memory cells e. B cells
Which of the following is (are) true concerning
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