3.3 Hearing

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 1

Are you ready?

- Phone in your locker

- Coats are on the coat rack or in your locker

- Bags are off the table

- Take off your hat or hoodie

- Books and laptops are on the table

- Did you do your homework?

 

3.3 Hearing

Chapter 3: Observing

Today

Welcome

Learning objectives

Test knowledge about the ears

Video

Instruction 3.3

Homework

End of class

Learning objectives

• You will learn about the construction of your ears and which sounds you are able to hear.

Why does an African elephant have such big ears?

1. To better capture sounds
2. To cool down
3. To communicate
4. All of the above

How do you call the outside of your ear?

1. Earshell
2. Auricle
3. Retina
4. Auditory canal

Which part of your ear can be damaged by ear buds or other sharp objects?

1. Auditory canal
2. Tympanic cavity
3. Auricle
4. Eardrum

Tekst

auditory/ear canal

auricle

eardrum

ossicles

cochlea

Tones in hertz

• Humans can hear between ± 20 en 20 000 Hz .

- Lowest limit of hearing (onderste gehoorgrens) = lowest tone someone can hear

- Highest limit of hearing (bovenste gehoorgrens )= highest tone someone can hear

-Hearing range  (gehoorbereik) = Range between highest and lowest limit

Elderly people: hairs on the sensory cells in the cochlea break. The highest limit drops to 15000 Hz

Sound level (Geluidsniveau)

In decibel (dB)

130 dB and higher: chance of becoming deaf

The Eustachian tube (De buis van Eustachius)

Tube that connects the tympanic cavity with the pharynx (keelholte). 

Arranges that the pressure of air is equal on both sides of the eardrum.

Ear infection (middenoorontsteking) = infected tympanic cavity

Sense of balance 

Sence of balance (evenwichtsorgaan) = organ at the cochlea in the ear; consists of 3 semicircular canals filled with liquid an sensory cells.

Function: to pervieve the twisting movement of your head. 

What?	3.3 assignments 4-7, 9, 11, 12, 16, 20
How?	In your workbook (or computer). Use the information from your textbook.
Help?	You may gently consult with your neighbor. Raise your hand if the two of you can't figure it out.
Time?	10 minutes
Finished?	Check your answers of 3.1-3.3. Write a summary of 3.1 and 3.2.
Product	You have practiced 3.3!

Let's discuss the lesson!

Don't pack your bags yet!

What did you learn today?

When de bell rings:

- Pull up your chairs

- Don't forget your phone