5.4 Hearing

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

B3 Hearing

Planning

1. Short revision 
   
   
2. what are the parts of your ear?
3. what do the parts of your ear do to help  you hear?
4. how does your ear help you keep your balance?

What's the name for information from the surrounding that can be picked up by sense organs?

1. Nerve
2. Impulse
3. Stimulus
4. Touch receptor

gentle contact is the stimulus for?

1. our sense of taste
2. our sense of smell
3. our sense of touch
4. our sense of hearing

Put in the most logical order:
-impulse -stimulus -sensory cell -brain

1. stimulus-impulse-sensory cell-brain
2. impulse-brain-sensory cell-stimulus
3. sensory cell-impulse-brain-stimulus
4. stimulus-sensory cell-impulse-brain

In our skin we have .... different types of sensory cells

1. 1
2. 2
3. 3
4. 4

 Hearing

Learning objective: You must be able to state the parts of the ear with their functions and characteristics.

What we discuss:

• Pitch and volume
  
• Parts of the ear
• Functions of the parts

Hearing

quiet to loud the amplitude differs

3+4

high pitched same amplitude more waves per second 1 / 2

How does this sound change??

1. From quiet to loud
2. From loud to quiet
3. From high pitch to low pitch
4. From low pitch to high pitch

How does this sound change?

1. From quiet to loud
2. From loud to quiet
3. From high pitch to low pitch
4. From low pitch to high pitch

structure of the ear

sounds are collected by the pinna

travel through the ear canal

hit the eardrum

the vibration enters the middle ear

in the end it enters the cochlea

sensory receptors 

sound is picked up by the pinna

air in the ear canal vibrates

The eardrum vibrates

hammer and anvil vibrate

stirrup vibrates

fluid in the cochlea vibrates

sensory cells are being stimulated

impulses are made

the auditory nerve brings impulses to the brain

Eustachian tube

connects middle ear to the throat

talking point page 127

Your ears help you to hear sounds from your surroundings. However, sometimes you can also hear sounds from inside your body, such as your breath or your heart beat.

Discuss with a classmate why you can hear these types of inner body sounds much better when you have a bad cold.

The tympanic cavity (middle ear) is connected to the back of the throat. When you have laryngitis bacteria can reach the middle ear through this connection and can cause an middle earinfection. At which spot will the infection be?

1. S
2. R
3. Q

Balance 

Semicircular canals--> filled with fluid. 

Detects the direction of movement and acceleration.

Muscles respond, maintains your balance.

Revision 

What did we talk about:

• what are the parts of your ear?
  
• what do the parts of your ear do to help you hear?
  
• how does your ear help you keep your balance?

Homework: 5.4