The pharmaceutical drug RU-486 is sometimes used for medical abortions. RU-486 blocks progesterone production. It cannot cross from the mother's blood into the placenta. The drug loses most of its abortive properties after the 1st trimester. This is likely because after the 1st trimester, the ________ begins producing a sufficient supply of progesterone and estrogen.
Fill in the blank(s) with the appropriate word(s).
placenta
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Which of the following muscles is NOT part of the quadriceps femoris muscle group?
a) rectus femoris b) biceps femoris c) vastus medialis d) vastus lateralis e) vastus intermedius
Which of the following is a function of the seminal fluid?
A) activation of spermatozoa B) production of sperm C) buffering the urethra and vagina D) providing the nutrient needed for sperm motility E) None of the answers are correct.
A patient with AIDS would be likely to react to an infection with a greater elevation of plasma cortisol than a person without the disease.
Answer the following statement true (T) or false (F)
What special characteristic of the respiratory membrane facilitates gas exchange?
A. The large surface area of the combined alveoli facilitates gas exchange. B. Smooth muscles in the walls of the alveoli hold the alveoli open to increase lung volume and surface area. C. The presence of alveolar macrophages and mucus keep the alveoli clear and reduce membrane thickness. D. Cartilages in the walls of the alveoli hold the alveoli open to increase lung volume and surface area.