The ________ is the kidney's sole blood supply
A) adrenal artery
B) renal artery
C) superior mesenteric artery
D) celiac artery
E) common iliac artery
Answer: B
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Before B cells secrete antibodies, they differentiate into _________.
A. stem cells B. antigen-presenting cells C. plasma cells D. T cells E. macrophages
A vaccine is effective because ________
A) the vaccine contains the antibodies necessary to fight infection B) the vaccine contains the lymphocytes necessary to fight infection C) the secondary response of the adaptive immunity is faster and more efficient the primary response D) B-lymphocytes are unable to mount an immune response the first time they are exposed to a new pathogen
During days 15-28 of the uterine cycle, increased production of progesterone causes the endometrium to double in thickness.
a. true b. false
The deepest stage of sleep is experienced during:
A) stage I. B) stage VI. C) stage III. D) stage IV.