Photoreception and Vision ACTUAL
QUESTIONS AND CORRECT ANSWERS
Photoreception - Correct answers✔✔The process of detecting photons, the basic units of visible
light, by the rods and cones in the retina.
Rod cells - Correct answers✔✔Retinal cells responsible for vision in low light conditions,
containing rhodopsin and sensitive to blue-green wavelengths of light.
Cone cells - Correct answers✔✔Retinal cells responsible for color vision and visual acuity,
containing different forms of opsin sensitive to specific portions of the visual spectrum.
Wavelength - Correct answers✔✔The distance between wave peaks of light energy, with human
eyes sensitive to wavelengths of 400-700 nm.
Nanometer (nm) - Correct answers✔✔One billionth of a meter, used to measure the
characteristic wavelength of visible light.
Pigmented Epithelium - Correct answers✔✔Absorbs photons not absorbed by visual pigments,
and phagocytizes old discs shed from the outer segment of photoreceptors.
Outer Segment - Correct answers✔✔Contains flattened membranous discs with visual pigment
molecules in photoreceptor cells, responsible for light absorption.
Inner Segment - Correct answers✔✔Contains the photoreceptor's major organelles and is
responsible for all cell functions other than photoreception.
QUESTIONS AND CORRECT ANSWERS
Photoreception - Correct answers✔✔The process of detecting photons, the basic units of visible
light, by the rods and cones in the retina.
Rod cells - Correct answers✔✔Retinal cells responsible for vision in low light conditions,
containing rhodopsin and sensitive to blue-green wavelengths of light.
Cone cells - Correct answers✔✔Retinal cells responsible for color vision and visual acuity,
containing different forms of opsin sensitive to specific portions of the visual spectrum.
Wavelength - Correct answers✔✔The distance between wave peaks of light energy, with human
eyes sensitive to wavelengths of 400-700 nm.
Nanometer (nm) - Correct answers✔✔One billionth of a meter, used to measure the
characteristic wavelength of visible light.
Pigmented Epithelium - Correct answers✔✔Absorbs photons not absorbed by visual pigments,
and phagocytizes old discs shed from the outer segment of photoreceptors.
Outer Segment - Correct answers✔✔Contains flattened membranous discs with visual pigment
molecules in photoreceptor cells, responsible for light absorption.
Inner Segment - Correct answers✔✔Contains the photoreceptor's major organelles and is
responsible for all cell functions other than photoreception.
