What organelles are small vacuoles containing oxidative enzymes?
A. peroxisomes
B. flagellum
C. endoplasmic reticulum
D. Golgi apparatus
E. nucleolus
A
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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).
The lungs remain inflated because
A. intrapulmonary pressure is less than intrapleural pressure. B. intrapleural pressure is less than intrapulmonary pressure. C. intrapleural pressure is exactly equal to intrapulmonary pressure. D. intrapleural pressure is exactly equal to atmospheric pressure.
Mesothelium, also called ____ tissue, consists of simple squamous epithelium
a. connective b. serous c. endothelium d. adipose
If the thyroid fails to develop properly from childhood, a condition called ______ results.
A) goiter B) cretinism C) acromegaly D) pituitary dwarfism E) myxedema