We can close our eyes but not our
We can close our eyes, but not our ears.
1. Structure of your ear. https: //www. youtube. com/watch? v=T 8 l. KKlnn. C 6 M a) Watch the video and make notes of all parts of your ear which you hear mentioned in it.
https: //www. youtube. com/watch? v=WOg. I 5 l. AR_b. Q b) Now listen to the following video on the same topic. It will help you with the other parts of ear:
stapes incus malleus semicircular canals auricle, pinna eardrum cochlea auditory nerve round window auditory canal Eustachian tube tympanic cavity
Differences in terminology • maleus = hammer • incus = anvil • stapes = stirrup • auditory canal = ear canal • eardrum = tympanic membrane • Eustachian tube = auditory tube
c) Listen again and answer the questions: 1. 2. 3. 4. 5. 6. 7. 8. What other functions apart from hearing does the ear system have? What are three parts of the outer ear? Which two things does the Eustachian tube connect? Which two parts make up the inner ear? What does cochlea do? What are the two functions of the eardrum? Why is the auditory (Eustachian) tube important? Why are children suffering from ear infections more often than adults?
• 1) difference between up/down, balance organ, orientation, complex movements • 2) auricle, auditory canal, outer part of the eardrum • 3) middle ear with nose/throat area • 4) vestibule (balance) + cochlea (filled with fluid) • 5) converts sound waves to nerve signals • 6) transmits soundwaves, prevents dirt and germs from entering the middle ear • 7) releases the fluid produced by middle ear, lets in the air to regulate the pressure • 8) their auditory tube is shorter, which means higher risk of infection
d) Describe how the ear works in your own words. Use the picture to illustrate what you are saying.
2. How old are your ears? Do the test and listen to the explanation. https: //www. youtube. com/watch? v=Vxcbpp. CX 6 Rk
3. Do you know how other people hear your voice? Try this simple test. https: //www. youtube. com/watch? v=z. Hos. Ayfh. Sp. A
4. How good is human hearing compared to animals?
Here are some interesting facts about animal hearing. • First, make sure that you know what the words marked in bold mean. • In pairs try to match the facts with the animals. • Compare with another pair. • Then check with the teacher.
Solution 1. dolphins 2. bats 3. cats 4. dogs 5. rabbits 6. sheep 7. elephants 8. owls 9. fish 10. chicken a) They hear mainly with their lower jaw bones. b) They use echolocation, a system of sound waves from their mouth or nose, to detect insects. c) They have a system of liquid-filled canals that gives them an excellent balance. d) They are able to hear a difference between the footsteps of different people. e) Their ears are able of wide rotation to tell them from where the sound is coming, they can hear a sound from the distance of 3 kilometres. f) They are very frightened by high-pitched sounds, such as dogs barking. g) They use infrasound to communicate over long distances, such as 1. 5 km. h) They have ears at different positions on their head, they are turning the head until the sound is coming identically to both ears – then they know they are looking in the direction where the prey is. i) They don´t have ears, they hear by decoding the vibrations caught by the so called lateral line. j) They can regrow hair cells in their ears and repair their hearing (humans cannot do this).
Sources: • https: //www. anatomylibrary 99. com/10 -human-ear-anatomy/labelthe-ear-anatomy-diagram/; 28. 8. 2017 • http: //www. philtulga. com/MSSActivities. html; 25. 8. 2017 • http: //www. ageukhearingaids. co. uk/hearing-aid-news/how-doesanimals-hearing-compare-humans-infographic; 25. 8. 2017
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