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Optic nerve sends impulses to cerebrum Blind spot retina attaches to nerve, no vision Fovea max vision Retina layer of receptor cells (rods and cones) that line back of the eye; changes light to impulses What are rods and cones? receptor cells in the retina that send impulses to cerebrum which turns image right-side up. Which receptor cells work best in dim light? Rod cells - they enable you to see black, white, and shades of gray. Aqueous humor shapes cornea Pupil allows light to enter; size of pupil adjusted by muscles in the iris. Cornea clear tissue that covers the front of the eye and bends light into pupil Lens flexible structure that focuses light onto retina Iris controls amount of light entering into the eye - is as individual as a finger print and even more detailed. Ciliary muscles pull lens for focusing Vitreous humor shapes eyeball; holds retina Sclera protective covering Choroid blood vessels Nearsightedness trouble seeing objects far away; concave lens for correction Farsightedness trouble seeing objects close up; convex lens for correction What is the function of ears sense organs that respond to stimulus of sound; ears convert sound to nerve impulses that your brain interprets What are the three regions of the ear outer ear, middle ear, inner ear describe the outer ear funnel-shaped to collect sound describe the middle ear consists of the eardrum, hammer, anvil and stirrup What is the function of the eardrum separates the outer ear from the middle ear; it's a membrane that vibrates when sound strikes it What is the function of the hammer, anvil and stirrup smallest bones in the body that occur in the middle ear; vibration passes from the hammer to the anvil to the strirrup. What is the function of the cochlea Occurs in the inner ear; tranfers impulses to the brain through the auditory nerve What are the semicircular canals? structures in the inner ear that controls balance How are the senses of smell and taste similar? Work closely together; both depend upon chemicals in the air and in food. The chemicals trigger responses in receptors in the nose and mouth. How is information about smell sent to the brain? THrough the olfactory nerve What basic tastes can the tongue distinguish sweet, salty, sour, bitter, and umami (brothy and meaty flavors) WHat is the largest sense organ skin WHat kind of receptors does the skin have? different kinds that respond to a number of stimuli. Where are receptors that respond to light touch and texture located? upper part of the dermis Where are receptors located that repond to pressure Deeper in the dermis What other receptors are located in the dermis heat, pain and cold What is concidered to be a drug? anything other than food that affects the body, primarily the nervous system. What is considered to be a medicine? drugs that treat medical problems What are the two classes of medicine? prescription and OTC What do stimulants do to your body and give examples? speed up CNS. Cocaine, nicotine, caffine What do depressants do to your body and give examples? slow down CNS. Alcohol, heroin What do inhalents and hallucinogens do to your body and give examples? altre perception. LSD, paint thinner What do anabolic steroids do to your body and give examples? increase muscle and strength. Heart and liver damage