Question

................... convert light (visible electromagnetic radiation) into signals that can stimulate biological processes.

• A. Thermoreceptor
• B. Photoreceptor
• C. Chemoreceptor
• D. None of the above

Answer 1

Answer: (B)

Photoreceptor

A photoreceptor is a specialized type of neuron capable of phototransduction. The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes. To be more specific, photoreceptor proteins in the cell absorb photons, triggering a change in the cell's membrane potential. There are currently three known types of photoreceptor cells in mammalian eyes rods, cones, and photosensitive retinal ganglion cells. The two classic photoreceptor cells are rods and cones, each contributing information used by the visual system to form a representation of the visual world, sight.