The greatest visual acuity is found at the:
A) lens
B) fovea centralis
C) ciliary body
D) optic disc
E) iris
Ans: B) fovea centralis
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Action potentials are normally initiated at the axon hillock because
a. there is a particularly high density of voltage-gated sodium channels there. b. threshold potential is lower there than at other sites along the plasma membrane. c. activation of sodium channels at the axon hillock results in a particularly strong inward current and consequent depolarization. d. all of these. e. none of these.
Which antibody is the only one capable of crossing the placenta from a pregnant woman to her developing fetus?
A) IgA B) IgM C) IgE D) IgG
The major pathway of communication between the right and left hemispheres is the
A. longitudinal fissure. B. cerebral sulci. C. hypothalamus. D. corpus callosum. E. cerebral gyri.
Functions of plasma proteins include
A. body temperature regulation. B. regulation of osmotic pressure. C. transportation of oxygen and carbon dioxide. D. serving as a source of energy for metabolism.