List and briefly describe the three processes that are used by the eye to form a clear image of object on the retina

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1 ) Refraction involves bending light rays as they move through different media in the eye to eventually form a focused inverted image on the central fovea, 2 ) Accommodation of the lens for near/distance vision involves changing the shape of lens using the ciliary muscle to help focus light rays on retina, and 3 ) Constriction of pupil involves an ANS reflex that helps prevent scattering of light through edges of lens.

Anatomy & Physiology

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Which cells form myelin in the spinal cord?

A. Microglia B. Oligodendrocytes C. Astrocytes D. Schwann cells E. Satellite cells

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Most visceral organs are innervated by only parasympathetic nerve fibers

a. True b. False Indicate whether the statement is true or false

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Sodium, potassium, calcium, chlorine, and phosphorus are all examples of ____

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