What part of the retina is responsible for the sharpest vision?
A. Optic disc
B. Ora serrata
C. Fovea centralis
D. Posterior retina
E. All of the choices are correct.
C
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How can a lever system work at a disadvantage but still be of use to us?
What will be an ideal response?
Collections of nerve cell bodies outside the central nervous system are called ________
A) ganglia B) nerves C) tracts D) nuclei
Which of the following statements concerning vitamin D is incorrect? Vitamin D
a. can be synthesized by the skin on exposure to sunlight. b. must be modified by biochemical alterations within the liver and kidneys before it is biologically active. c. enhances the effect of calcitonin on bone. d. increases Ca2+ absorption in the intestine. e. deficiency in children results in rickets.
In which trimester of pregnancy do all major organs systems begin to develop?
A) first B) second C) third D) None of the listed responses is correct.