Ch 16 MCQ + short essay

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Last updated 8:05 PM on 4/11/26
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14 Terms

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Short essay:

  1. What and where is the fovea centralis, and why is it important?

The fovea centralis is a small depression in the center of the macula lutea of the retina. It contains only cones and no rods, making it the area of sharpest vision and highest color discrimination.

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Short essay:

  1. Name two special senses whose receptor cells are replaced throughout life, and two special senses whose receptor cells are replaced so slowly that there can be no functional regeneration.

  • Replaced throughout life: Olfaction (smell) and Gustatory (taste).

  • Little to no regeneration: Vision (photoreceptors) and hearing (hair cells of cochlea).

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Short essay:

  1. Describe the function and the innervation of both the sphincter and dilator muscles of the pupil (in the iris of the eye).

Sphincter pupillae: Constricts the pupil; innervated by parasympathetic fibers (CN III).

Dilator pupillae: Dilates the pupil; innervated by sympathetic fibers.