Sympathetic stimulation of the iris causes
A) Opening of the iris by stimulating the dilator muscles
B) Closing of the iris by stimulating the dilator muscles
C) No effect on the iris
D) Opening of the iris by stimulating the sphincter muscles
E) Closing of the iris by stimulating the sphincter muscles
Correct Answer:
Verified
Q6: The optic nerve makes initial synaptic contact
Q7: Contraction of the ciliary body
A) Releases tension
Q8: The “blind spot” in the visual field
Q9: “On center” bipolar cells
A) Are inhibited by
Q10: Most of the refractive power of the
Q12: Cones are most highly concentrated in the
A)
Q13: At rest, the refractive power of the
Q14: The function of the iris is to
A)
Q15: The shape of the eyeball is maintained
Q16: Focusing on objects at the near point
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