Rods, Cones & The Ear

	Cones	Rods
Intensity of light	These cells are less sensitive to light and function well in bright light	These cells are more sensitive to light and function well in dim light
Wavelengths of light sensitive to	Three types of cones are found in the retina. One type is sensitive to red light, one type to blue light and one type to green light	Only one type of rod is found in the retina. It can absorb all wavelengths of visible light
Ratio of receptor cells to neurones – how does this effect visions?	The impulses from a single cone cell passes to a single nerve fibre in the optic nerve	The impulses from a group of rod cells pass to a single nerve fibre in the optic nerve

2.   Draw and label a diagram of the ear (photograph this and upload it?) including: pinna, eardrum, bones of the middle ear, oval window, round window, semicircular canals, auditory nerve and cochlea.

Diagram of the ear:

Source:

Damon, A. McGonel R. Tosto P. and Ward W., 2007, Higher Level Biology, Essex: Pearson Education Limited