If You Shine a Light into One Eye Both Pupils

question 21

Multiple Choice

If you shine a light into one eye both pupils will constrict. The best explanation for this is________.

• A) this in fact does not occur and information from both eyes is always separated
• B) information from one eye is directly and immediately transferred to the other eye to maintain alignment of the eyes
• C) sensory input from the retinas of both eyes converges at the optic chiasm and information from each eye is delivered to both the left and right sides of the brain
• D) a small portion of light always enters the other eye

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Definitions:

Afferent Arteriole

A small blood vessel that carries blood toward the glomeruli of the kidney as part of the filtration process.

Tubular Secretion

Movement of materials, by means of active transport, from the blood into the filtrate of a nephron.

Active Transport

Carrier-mediated process that requires ATP and can move substances against a concentration gradient.

Glomerular Filtrate

The fluid that passes from the blood through the glomerular capillaries of the kidneys during the filtration process.