What type of immune defense cell is selectively invaded by AIDS virus?
a. cytotoxic T cells.
b. helper T cells.
c. suppressor T cells.
d. macrophages.
e. neutrophils.
B
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Pressure from the cardiovascular system forces some ________, made of proteins and fluids, out of the cardiovascular capillaries and into the ________ space, or the space between cells.
A. pathogens; thoracic B. antibodies; pleural C. antigens, capillary D. plasma; interstitial
The secretory units of the mammary glands are the __________
Fill in the blank with the correct word.
During ________, the uterus is tented (erected) and the cervix is withdrawn from the vagina. Typically, the clitoris is engorged and the labia are bright red to violet due to hyperemia.
A. pregnancy B. excitement C. detumescence D. resolution E. orgasm
Matthew has taken a "mental health day" from work. At this moment, the level or neurotransmitter released by the photoreceptors in his eyes is at maximum. What is Matthew likely doing right now?
A. Matthew is sound asleep in a very dark room. B. Matthew is in a quiet bookstore reading the newest issue of his favorite magazine. C. Matthew is at the beach enjoying a bright sunny day.