The wall of the bladder contains ________________________________________ muscle
Fill in the blank(s) with correct word
smooth
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T cells and B cells can be activated only by
A) pathogens. B) interleukins, interferons, and colony-stimulating factors. C) cells infected with viruses, bacteria, or cancer cells. D) exposure to a specific antigen at a specific site in a plasma membrane. E) disease-causing agents.
Changes in the immune system that accompany aging include all of the following except
A) T cells becoming less responsive to antigens. B) fewer cytotoxic T cells responding to infections. C) decreased numbers of T helper cells. D) more efficient secondary responses. E) B cells are less responsive.
A "widow's hump" or "dowager's hump" is an exaggerated thoracic curvature that is technically called ________.
Fill in the blank(s) with the appropriate word(s).
Where would you find the protein crystallin?
A. In the lens B. In the choroids C. In the ciliary body D. In the optic nerve E. In the retina