C Touch, smell, taste

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

Today

• Check what you remember from last week
• Reflexes 
• Homework check - finish part A and B
• Time to work on assignments

Sense organs send signals through the nerves to the ...

1. eyes
2. ears
3. brain
4. muscles

Match the correct adequate stimulus to the sensory organ

Sound

Taste

Light

Smell

What is habituation?

What is the threshold value?

C - Touch, smell, taste

After this lesson you'll know

• The parts of the skin and their function
• The parts of the nose and the tongue
• How taste and smell works in your body

BS 2 Touch, smell, taste

Functions of the skin?

Experiment touch receptors (15 min)

• Work in groups of 3
• Blindfold one person. Bend the tweezers in such a way that the two tips are 10 mm apart.
• Touch the skin of the test person with the two tips at the same time. 
• Do this at three places: tip of the index finger (wijsvinger), lower arm and the tip of the nose. 
• The test person tells if he/she feels one or two tips of the tweezers. Put this in the table. 
• Repeat this with the tweezer tips at 8, 6, 4 en 2 mm apart, and with only one tweezer tip.

Skin - consists of two layers:

Epidermis and dermis

Epidermis

Corneal layer - dead cells

Basal layer - living cells that make new cells

Dermis

Blood vessel

Glands (klieren)

Muscles 

Hair

Receptors + nerves

Sensory receptors

 The nose 

And the tongue

And the tongue

In which skin layer are the sensory receptors located?

1. Basal layer
2. Epidermis
3. Dermis
4. Corneal layer

Your skin is 33°C, you take a shower and the water temperature is 25°C. Which receptors will send an impulse to the brain?

1. Pressure receptor
2. Cold receptor
3. Heat receptor

Your nose plays an important role in how you taste things

1. True
2. False

You have different taste buds for every taste (sweet, salt, bitter, sour)

1. True
2. False

Let's do some work!

Learnbeat C