Which statement regarding the role of T lymphocytes (T cells) is true?
A) T lymphocytes (T cells) constitute the cell-mediated arm of the adaptive defenses.
B) T lymphocytes (T cells) produce antibodies.
C) T lymphocytes (T cells) activate lymphocytes that respond to specific antigens.
D) T lymphocytes (T cells) can target specific extracellular antigens.
E) T lymphocytes (T cells) oversee humoral immunity.
A
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A boy who has not passed through puberty sustains an injury to his anterior pituitary such that FSH is no longer released, but LH is normal. After the individual grows to maturity, one would expect that he would
A) have impaired function of the interstitial cells. B) produce large amounts of inhibin. C) be impotent. D) be sterile. E) not develop secondary sex characteristics.
If the diameter of your microscope field is 1 mm at low power (10×) and your ocular lens is 10×, then what is the diameter of your field when you switch to the 50× objective lens?
A) 0.2 mm B) 0.02 mm C) 0.002 mm D) 2 mm
The lymphatic system includes:
a. the heart b. arteries c. lymph nodes d. all of the above
Sensitization to an allergen during the initial exposure leads to the production of large quantities of
A) antigen-antibody complexes. B) IgE antibodies. C) IgD antibodies. D) opsonins. E) Tc cells.