5.4 The nervous system part 3

Bs 4: The nervous system part 2
1 / 16
suivant
Slide 1: Diapositive
BiologieMiddelbare schoolvwoLeerjaar 1

Cette leçon contient 16 diapositives, avec diapositives de texte et 2 vidéos.

Éléments de cette leçon

Bs 4: The nervous system part 2

Slide 1 - Diapositive

Planning for today
  •  Look back at last class
  •  Bs 4. nerve cells/nerves and reflexes
  • Test your reflexes

Slide 2 - Diapositive

Learning goals

  • You must be able to describe the structure of a nerve cell and a nerve. 
  • You must be able describe the three types of nerve cells. 
  • You must be able to tell what reflexes are and how they work.

Slide 3 - Diapositive

Senses of humans

Slide 4 - Diapositive

Slide 5 - Diapositive

Path taken by nerve impulses
notes:
2 types of pathways
  1. Conscious reaction - voluntary response, example: girl and   chocolate -> impuls goes to brain.
  2. Reflex - involuntary response, impulse does not go to the     brain but stays within the CNS
 example: withdrawal reflex = hand touches fire 

Slide 6 - Diapositive

How does the nervous system work
Notes:
Sensory cell receive stimulus from outside (ex. chocolate)
Sensory cells                                                                                                                         = impulses                            =   nerves   

     brain    

 muscles

Slide 7 - Diapositive

Nerve cell

Slide 8 - Diapositive

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

Slide 9 - Diapositive

Slide 10 - Diapositive

What is a nerve?
Notes: 
nerve = a bundle of axons of nerve cells surrounded by a tough, protective layer

Slide 11 - Diapositive

Slide 12 - Diapositive

Reflexes
Notes
A reflex is a fixed, fast and involuntary reaction to a certain stimulus.

In a reflex, the impulses do not go through your brain first (except for reflexes that take place in your head)

Why does this happen?

Slide 13 - Diapositive

Slide 14 - Vidéo

Test your reflexes
* Make groups of 2 or 3 people
* Go to your studiewijzer and open the document: Werkblad reflexen 
* Do al 3 of the exercises to test your reflexes!

Slide 15 - Diapositive

Slide 16 - Vidéo