Explain how visual stimuli is relayed to the brain and how it is processed there.

The optic nerve, leading from the eyeball, allows information that we see to travel to the optic chiasm. This is the point at which axons from the inside half of each eye cross over and project to the opposite half of the brain. The purpose of the optic chiasm is to ensure that visual signals go to both hemispheres of brain. The majority of neural signals are sent to the thalamus for processing and are then distributed into areas of the occipital lobe. The neural signals are then received by the visual cortex (the ultimate destination for visual input), which is located at the occipital lobe. There, feature detectors assist us in interpreting what it is we are actually seeing as they respond to specific features of the object before us. These specific cells will fire as we encounter various shapes or movements.  

Explanation:

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.