Lymphocytes respond only to antigens that have been processed and presented to them by
a. neutrophils.
b. eosinophils.
c. macrophages.
d. helper T cells.
e. interleukin 2.
C
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A flu vaccine is needed seasonally to be effective but a polio vaccine is only needed once. The best explanation of this is ________
A) the flu vaccine is substantially weaker than the polio vaccine B) exposure to flu vaccine produces no memory cells from proliferating B-lymphocytes C) the polio virus is substantially weaker than the flu virus D) the flu has several strains that change seasonally
During a cardiac cycle, how many of the four chambers contract at any one time?
A. 1 B. 2 C. 4 D. Highly variable, depending on the heart beat rate E. None of these answers is correct.
What is the difference between a direct acting neurotransmitter and an indirect acting neurotransmitter?
What will be an ideal response
The fusion of the common hepatic duct with the cystic duct forms the
A) hepatic portal vein. B) porta hepatis. C) common bile duct. D) common pancreatic duct. E) bile canaliculus.