After implantation of the embryo, the corpus luteum can secrete progesterone at high levels without being shut off because
a) it is not under regulatory control
b) the pituitary secretes FSH
c) the levels of estrogen have decreased
d) the hypothalamus is actively secreting
e) the placenta secretes chorionic gonadotropin which is like luteinizing hormone (LH)
A man was involved in an accident and suffered extensive damage to the cerebellum. Which of the following functions would he be unable to perform?
a) Recalling facts prior to his accident
b) driving his car
c) Reading for long periods
d) Digesting his food
e) distinguishing between hot and cold objects
Motility in the alimentary tract is important to all the following functions except
a) translocation of food
b) increased surface area
c) expulsion of food
d) continuous exposure of material to secretory and absorbing surfaces
e) mechanical grinding and mixing
All the following occur as muscle contract EXCEPT
a) z bands come closer
b) H zones stay the same
c) A bands stay the same
d) I bands decrease
e) Thick and thin filaments slide past each other
The prostaglandins, which may eventually prove to be effective birth control substances, are classified as
a) steroids
b) 20-carbon fatty acids
c) carbohydrates
d) lipoproteins
e) proteins
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