Many pituitary hormones are secreted in a circadian rhythm. A structure important to the regulation of circadian hormonal rhythms is the:
A. paraventricular nucleus
B. supraoptic nucleus
C. superior fornix
D. suprachiasmatic nucleus
E. arcuate nucleus
ANS: D
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Which of the following is formed via intramembranous ossification?
A) tibia B) humerus C) carpal bones D) femur E) mandible
Which of the following statements regarding contraction of a skeletal muscle fiber is TRUE?
A. Thick filaments shorten when muscle cells contract. B. Some contractions occur without cross-bridge activation. C. Contracting muscle fibers do not always shorten. D. Contraction does not always require the occurrence of an action potential. E. Contraction only occurs following summation of action potentials from many motor neurons.
The ________ muscle attaches to the radial tuberosity.
A) biceps brachii B) anconeus C) supinator D) brachioradialis E) None of the answers are correct
The __________ ligament is a sheet of mesentery that attaches the liver to the anterior abdominal wall.
Fill in the blank(s) with the appropriate word(s).