5.5 smell and 5.6 taste

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

pinna

ear canal

eardrum

eustachian tube

cochlea

hammer

stirrup

anvil

eardrum

earwax

auditory nerve

eustachian tube

Keeps the eardrum flexible

controls the airpressure in your middle ear.

transports impulses to your brain

Passes the vibrations on to your hammer, anvil and stirrup

sound is picked up by the auricle

air in the auditory canal vibrates

The eardrum vibrates

Hammer and anvil vibrate

the stirrup vibrates

fluid in the cochlea vibrates

sensory cells are being stimulated

impulses are made

the auditory nerve brings impulses to the brain

1

2

3

4

9

8

7

6

5

Balance ear

Semicircular ducts --> filled with fluid. 

Detects the direction of movement and acceleration.

Muscles respond, mantains your balance.

SENSE

SENSE ORGAN

STIMULUS

SENSORY 

RECEPTOR

nerve cells

Hearing

Sound waves

Ear

Convert stimuli into nerve impulses

Transport nerve impulses 

Form a connection between the senses and the brain

What is smell?

Write down a
specific smell that reminds
you of a place/person.

How do you detect smell?

The nose:

- hairs filter out dirt

- snot catches dust and germs

- our nose helps us to smell and to taste

- if you  break your nose you could lose your sense of smell.

when you inhale odour it becomes dissolved in the mucus. 

Mucus

Dust and germs get trapped

Cilia (little hairs) move it up your nose an throat

mucus is constantly produced

keeps in clean

TO WHICH ORGAN SYSTEM DOES THE NOSE BELONG?

1. MUSCULAR
2. RESPIRATORY
3. CIRCULATORY
4. SKELETAL

Olfactory cells

What are the olfactory cells used for?

1. the exchange of gas molecules
2. clearing the nasal cavity of dust particles
3. they are used for the sense of smell
4. Clearing the bronchiole of dust particles

Which cells hold onto the dust you inhale?

1. Olfactory cells
2. Mucus producing cells
3. Nose hairs
4. Ciliated cells

WHAT TYPE OF BREATHING IS BETTER FOR YOUR HEALTH?

1. BREATHING THROUGH YOUR NOSE
2. BREATHING THROUGH YOUR MOUTH

homework

assignments of 5.5

The Tongue:

Tongue is covered with taste buds.

Chemicals in your food and drink dissolve, this is is how your taste buds detect the taste.

tongue

   taste bud

mucus gland       nerve cells

taste bud

sensory cell      

nerve cells

The Tongue:

- we taste only five things: sweet, sour, salty, bitter, and umami.

- our nose does most of the tasting

- babies instinctively do not like bitter or sour flavours (protection) 

- your tongue is very strong and made up of 8 muscles

How do we call the sensory receptors of the tongue?

Talking

Memory plays an important part in recognising what you taste or smell. If you have never tasted or smelled something before, it is hard to guess exactly what it is. 

Have you ever experienced this? 

Describe such a situation to a classmate. Take turns

Why do we taste badly when we have a cold?

1. we do taste but because we feel ill our brain doesn’t register the flavours.
2. because the nasal cavity is full of snots and no chemicals get to the receptors
3. because the nerves are broken
4. the taste buds are covered with mucus

The Tongue:

Homework

assignments of 5.5