The gray matter on the right and left sides of the spinal cord is connected by a
A) corpus callosum.
B) gray commissure.
C) intermediate mass.
D) vermis.
Ans: B) gray commissure.
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Human intelligence is most closely related to the
A. amount of cerebrospinal fluid. B. number of active synapses. C. number of neurons. D. size of the brain. E. weight of the brain.
The distribution of ABO blood types among Korean Americans differs markedly from that of Native Americans in that
A. Korean Americans have about equal frequency of types O, A, and B, with 10% AB, whereas Native Americans have mostly type O, with type AB very rare. B. nearly all Korean Americans are blood types A or B. C. Native Americans have about equal frequency of types O, A, and B, with 10% AB, whereas Korean Americans have mostly type O, with type AB very rare. D. nearly all Native Americans are type AB, with very few type O.
The large range of movement of the thumb compared to that of the fingers is derived from the structure of which of the following?
A. the thumb's carpometacarpal joint B. the thumb's intermetacarpal joint C. the thumb's metacarpophalangeal joint D. all of the above
The blood-brain barrier is made up of
A. astrocyte perivascular feet and the falx cerebri. B. astrocyte perivascular feet and capillary endothelial cells. C. astrocyte extensions and dural sinuses. D. ependymal cells and venous blood vessels. E. microglial extensions and capillary endothelial cells.