V1c 14-03

• Biologie
• Middelbare school
• vwo
• Leerjaar 1

Planning for today

• Repeat Bs. 7 (10 min)
• Tips for studying
• Checklist + exercises 

After this class

You can explain when senses convert stimuli into nerve impulses.

You can name the structure and function of three types of nerve cells.

How impulses start

Stimulus needs to be strong enough. The lowest intensity of stimulus that causes an impulse = threshold value.

A stimulus must first reach the threshold value. If the stimulus then gets even stronger, the impulse frequency increases: more impulses are sent every second. The strength of the signal is always the same in an impulse 

Adequate stimuli

A stimulus that sensory cells are particularly sensitive for 

Sensory cells in your eyes respond to light

Light is the adequate stimulus

Non-adequate stimuli

Sometimes sensory organs will response to other stimuli

When you get hit in your eyes, you will see "stars"

But, the threshold value is higher than for the adequate stimulus

Why do you 'forget' the feeling of wearing your clothes during the day? 

Habituation = gewenning

If a stimulus doesn't go away for a long time, your sensory cells will produce less impulses

You don't really feel your clothes on your body because of habituation

Tips for studying 

Engels lastig?

-Zet je online boek in het Nederlands. Lees de tekst door en daarna nog een keer in het Engels, leer de namen en begrippen ook in het Engels.

-Vul de summary (samenvatting) in die op Som staat. Hier leer je ook de begrippen in het Nederlandse en Engels.

-Maak flashcards van de begrippen.

-Gebruik de checklist. Check af wat je al kan, lees en oefen de punten waar je nog moeite mee hebt. 

-Maak de worksheets.

-Oefen online op biologiepagina.nl (is wel in het Nederlands).

-Maak de D-toets die op som staat. 

-Probeer de plaatjes in het boek uit te leggen aan iemand. Gebruik hierbij de begrippen die erbij horen. Als je iets kan uitleggen heb je veel stof al onder de knie!

Lets get to work  

- Read Bs. 7 and make exercise 1,2,3,4,5 (if you haven't done it yet)

- Done? Go to your studiewijzer: Som -> vakken -> biologie -> Perception -> checklist. 

See what you already know. Read and practice what you don't know yet.

Write down any questions that you have!

Sensory organs

Summary:

Stimuli

Impuls 

Touch

Light

Sound

Taste

smell

The nervous system

The nervous system is made up of:

• the central nervous system 

--> Brain + spinal cord

• the nerves.  

the nerves connect the central nervous system to all parts of the body.

How does the nervous system work?

Notes:

Sensory cell receive stimulus from outside (ex. chocolate)

Sensory cells                                                                                                                         = impulses                            =   nerves   

     brain    

 muscles

Structure of the nerve cell 

Notes:

1. Cell body - located in or near the CNS

2. Axon - conducts (vervoert) impulses to and from cell body