Which of These Is Most Responsible for "Light Adaptation"-The Process

question 84

Multiple Choice

Which of these is most responsible for "light adaptation"-the process by which we only gradually become able to see objects in a brightly lit place after being in the dark?

• A)Cone receptors are very hyperpolarized in the dark,and they must be exposed to bright light for awhile before they will depolarize.
• B)Rhodopsin is quickly inactivated in the presence of bright light so rods become unresponsive,and the higher-acuity cones then become the main detectors of vision.
• C)Because rods are more sensitive to light than cones,they gradually become extremely activated in bright light.
• D)Cones and rods are stimulated equally,leading to difficulties in interpreting the sensory inputs to the brain.
• E)Rhodopsin is not activated by colored light,and the lack of stimulation causes rods to gradually depolarize when we are exposed to bright light.

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Definitions:

Lumbar Plexus

A network of nerve fibers in the lumbar region of the body, providing sensation and movement.

Cervical Plexus

A network of nerves in the neck that supplies movement and sensation to the neck, upper shoulders, and part of the arms.

Patellar Reflex

A reflex action in which the patellar tendon is tapped, causing the quadriceps muscle to contract and kick the lower leg forward.

Rectus Femoris Muscle

A muscle of the anterior thigh that is part of the quadriceps group, involved in knee extension and hip flexion.