The fifth senses

Light reflected from an object enters our eyes through the [blank_start]cornea[blank_end] and [blank_start]pupil[blank_end].The amount of light entering our eyes is controlled by the [blank_start]iris[blank_end]. The iris gives the eye its colour.The [blank_start]lens[blank_end] focuses the light on the [blank_start]retina[blank_end] at the back of the eye.Nerve [blank_start]receptors[blank_end] in the retina transmit the [blank_start]information[blank_end] to the optic [blank_start]nerve[blank_end] which then sends the information to the [blank_start]brain[blank_end]. The place where the optic nerve leaves the eye is called a [blank_start]blind[blank_end] spot. This area does not respond to [blank_start]light[blank_end].

Chemicals in the air enter our nose through our [blank_start]nostrils[blank_end]. The chemicals then come into contact with nerve [blank_start]receptors[blank_end] which send the information to the brain via the [blank_start]olfactory[blank_end] nerve. Substances enter our [blank_start]mouth[blank_end] and come into contact with our [blank_start]tongue[blank_end]. The tongue is covered in taste [blank_start]buds[blank_end] which have receptor [blank_start]cells[blank_end]. These receptor cells detect the different [blank_start]tastes[blank_end] (salty, sweet, [blank_start]bitter[blank_end] and [blank_start]sour[blank_end]) and send the information to the brain. The skin covers and [blank_start]protects[blank_end] our whole [blank_start]body[blank_end]. The middle [blank_start]layer[blank_end] of skin, called the [blank_start]dermis[blank_end], contains nerves and blood [blank_start]vessels[blank_end]. These detect sensations such as [blank_start]heat[blank_end], pressure and [blank_start]texture[blank_end].

Put the names in the correct place