Effector cells, in order to avoid returning to the lymph nodes
A. up-regulate chemokine receptors to allow them to home to site of infection.
B. down-regulate L-selectin, so they do not enter the high-endothelial venules (HEVs).
C. down-regulate chemokine receptors, so they do not enter the high-endothelial venules (HEVs).
D. Both A and B.
E. Both B and C.
D
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Adverse effects of ephedra include all of the following, EXCEPT
A. panic attacks. B. nausea. C. seizures. D. lethargy.
Breastfeeding infants until 6 months of age has been shown to reduce the incidence of _____
A) cerumen impaction B) Meniere's C) otitis media D) retinoblastoma
Mary has a heart rate of 64 bpm. Identify the resting heart rate category for her.
A. Excellent B. Good C. Average D. Fair E. Poor
Radon is a(n) ________.
A. fluid B. solid C. gas D. enzyme