Normally menstruation occurs when ________
A) blood levels of estrogen and progesterone decrease
B) blood levels of FSH fall off
C) the corpus luteum secretes estrogen
D) blood levels of estrogen and progesterone increase
A
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Infection with the HIV virus occurs through
A) eating contaminated food. B) airborne droplets from coughs and sneezes. C) intimate contact with an infected person's body fluids. D) casual contact with an infected individual. E) sharing clothes with an infected individual.
Given two muscles of equal mass, a short, thick muscle and a long, thin muscle, one would expect the short, thick muscle to
A) Contract with a greater force. B) Have its sarcomeres arranged in series rather than parallel. C) Shorten faster and further, but generate less force. D) All of the above
In an adult, a solid, cordlike structure called the ______ ______ represents the
former umbilical vein. Fill in the blank(s) with correct word
The _______ space seperates the dura mater from the arachnoid mater.
A. Epidural space B. Subarachnoid space C. Subdural space D. Dura space