Presentation on theme: "Senses- Ears Hearing and balance are the main functions of hearing. Hearing works with the other 4 senses to aid us in obtaining information and keeping."— Presentation transcript:
1 Senses- EarsHearing and balance are the main functions of hearing. Hearing works with the other 4 senses to aid us in obtaining information and keeping our bodies upright.
4 II. Parts of the Ear 1. Outer Ear Pinna- fleshy curved part that is attached to each side of the head. It collects sound waves and directs them into the ear.External Auditory Canal- a passageway about 1in. Long. Is lined with fine hairs and wax producing glands.Tympanic Membrane (eardrum)- a thin sheet of tissue about ¼ inch across. Separates the outer ear from the middle ear
5 Parts of the Ear 2. Middle Ear - Ossicles- 3 small bones that are linked together and connect from the eardrum to the inner ear.1. Malleus- Hammer bone is the first and largest of the 3 ossicles.2. Incus- Anvil bone is the middle bone3. Stapes- Stirrup bone is the last and smallest of the 3 ossicles. Also, connects the middle ear to the inner ear.
6 Parts of the Ear 2. Middle Ear cont. Mastoid process- small air-filled spaces in the bones that lie behind the middle ear.Eustachian Tube- 1.5 inch long tube that connects the ear to the throat Equalizes pressure on either side of the ear.
7 Parts of the Ear 3. Inner Ear Oval Window- where stapes connects to the vestibule.Vestibule- (snail head) tiny baglike structures lined with hairs (balance).Semicircular Canals- 3 canals set at right angles to one another that control your balance.
8 Inner Ear ContinuedCochlea- (snail shell) 3 fluid filled tubes that contain thousands of tiny hair cells. Organ of Corti located inside. Auditory Nerve- nerves attached to hairs in cochlea that convert sound waves to brain for processing. Round Window- expands as oval window is pushed in from vibrations.
9 The Hearing Process Vibrations in the air cause sound waves Sound waves are collected by the pinnaContinue through external auditory canalEardrum vibratesMalleus, Incus, Stapes vibrateOval window moves in and out with the vibrationsVibrations travel into cochlea where hairs are stimulatedHairs trigger nerve impulses to auditory nerveAuditory nerve send impulses to brain for processing
10 Balance Semicircular canals are responsible for balance Fluid in the crista of the semicircular canals move hairs when body is movedWhen body moves, hairs bend and send impulses to brain.Brain sends impulses to muscles to compensate for movement
11 Prolonged exposure to loud noise can lead to hearing loss!!!! The longer you are exposed to these loud sounds, the tiny hairs are damaged permanently!!!!!They do not grow back if they are damaged!!!!Sounds above 80db are considered potentially hazardous
12 Sound is measured by decibels Sound is measured by decibels. Here are some examples of different sounds.Sounds dB SPLRocket LaunchingJet EngineThunderclap, Air Raid Siren 1 MeterJet takeoff (200 ft)Rock Concert, DiscothequeFirecrackers, Subway TrainHeavy Truck (15 Meter), City TrafficAlarm Clock (1 Meter), Hair DryerNoisy Restaurant, Business OfficeAir Conditioning Unit, Conversational Speech 60Light Traffic (50 Meter), Average Home 50Living Room, Quiet OfficeLibrary, Soft Whisper (5 Meter)Broadcasting Studio, Rustling Leaves 20Hearing Threshold
13 What else does loud noise affect? Noise not only affects hearing. It affects other parts of the body and body systems.It is now known that noise:Increases blood pressureHas negative cardiovascular effects such as changing the way the heart beatsIncreases breathing rateDisturbs digestionCan cause an upset stomach or ulcerCan negatively impact a developing fetus, perhaps contributing to premature birthMakes it difficult to sleep, even after the noise stopsIntensifies the effects of factors like drugs, alcohol, aging
14 Protect Yourself from Noise Limit your exposurePump down the volume!Educate yourself and othersHave your hearing tested regularlyWear ear protection