Which of the Following Is an Explanation for the Higher

question 84

Multiple Choice

Which of the following is an explanation for the higher acuity of the visual system at the fovea, relative to the periphery of the retina?

• A) A foveal ganglion cell may receive information from a single photoreceptor, whereas a peripheral ganglion cell may receive information from multiple photoreceptors.
• B) The fovea contains only rods, which are directly connected to the ganglion cells.
• C) Peripheral photoreceptors are more likely to be damaged by prolonged light exposure.
• D) The foveal photoreceptor cells contain more photopigment per cell.
• E) Peripheral photoreceptors are more isolated from bipolar cells and thus require greater activation in order to provoke a visual response.

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Definitions:

Imaging

The process of creating visual representations of the interior of a body for clinical analysis and medical intervention.

Physiologic Function

The normal or healthy functioning of a living organism or any of its parts.

Positron Emission Tomography

An imaging technique that uses radioactive substances to visualize and measure changes in metabolic processes in the body.

Residual Barium

Barium remaining in the intestinal tract following evacuation at the completion of X-ray studies.