What do the basal nuclei coordinate?
a. slow twitch muscle fibers
b. spinal reflexes
c. slow, sustained movement
d. fast movement
e. fast twitch muscle fibers
c
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This organ's stroma is composed of hormone-secreting epithelial cells.
A. Liver B. Spleen C. Appendix D. Thymus
What type of G-proteins are associated with the visual cycle?
A. Gustducins B. Transducins C. Roducins D. None of the choices are correct.
The actions of thyroxine ________ the production of metabolic heat.
A. increase B. have no effect on C. decrease
Which hormone directly stimulates development of the male reproductive system, secondary sexual characteristics, and sustains sperm production and the sex drive throughout adult life?
a) progesterone b) testosterone c) estradiol d) gonadotropin releasing hormone