How many electrons do most atoms need in their second outer shell in order to be stable?
A) two
B) three
C) four
D) six
E) eight
E) eight
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The arteries
a. serve as rapid-transit passageways from the heart because of their large radii b. act as a blood reservoir because they have the capacity to store large volumes of blood with little change in their internal pressure c. are the major sites of blood flow resistance in the vasculature d. are the site of exchange between the blood and surrounding tissues e. always carry oxygenated blood
The auditory tubes open into the ________.
A. nasal cavity B. pharynx C. larynx D. oral cavity
The hormones that maintain the uterine wall during the last 5 to 6 months of pregnancy
are A) placental lactogen and relaxin. B) FSH and LH. C) human chorionic gonadotropin and synthetic estrogen. D) placental estrogen and progesterone.
Select the correct statement regarding smooth muscle
a. it composes the walls of the heart. b. it is absent in the walls of hollow organs. c. its cells are multinucleated. d. its cells are spindle-shaped. e. its cells lack actin and myosin.