Which structures connect one gyrus to another within the same cerebral hemisphere?
A. Association tracts
B. Projection tracts
C. Commissural tracts
D. Spinothalamic tracts
E. Corticospinal tracts
A. Association tracts
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When women with breast cancer undergo surgery to remove the tumor or the entire breast, the axillary lymph nodes are often removed as well. Why?
A. In removing the breast, the blood supply to the nodes is removed and they will inevitably cease to function. B. The axillary lymph nodes receive lymph from the breast and may contain cancer cells. C. The nerves that supply the axillary lymph nodes are often cut during the breast surgery. D. It is impossible to remove the breast without physically damaging the lymph nodes. E. With the removal of the breast, there is no further need for lymph drainage and filtering in that part of the body.
What are the two major regulatory systems in the body?
a. nervous system and urinary system b. endocrine system and urinary system c. nervous system and endocrine system d. circulatory system and endocrine system e. nervous system and circulatory system
Which statement about fixed action patterns is NOT true?
a. They occur in both vertebrates and invertebrates. b. They are not considered to be reflexes. c. They use command fibers located in the central nervous system. d. They are generated in response to a specific stimulus. e. A species of animals will carry out the behavior in the same manner.
John Musick and Julia Ellis have proposed that the ancestral reproductive mode for elasmobranchs was "yolk-sac viviparity
" That is, embryos were retained throughout their development in the oviducts of the female and emerged as miniatures of the adults (i.e., viviparity), but nutrition was provided by yolk that was deposited at the time the egg was formed, not from the mother during development (i.e., lecithotrophy, not matrotrophy). They suggest that oviparity (depositing eggs that develop outside the body of the mother) was associated with the evolution of small body size because it increased the fecundity of small species of elasmobranchs. What is their reasoning? That is, why would oviparity provide greater fecundity than viviparity for small species of elasmobranchs? What other factors might make one mode superior to the other?