B - The nervous system

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

The nervous system 

On your table:

- Closed MacBook

- Notebook

- Pencil case 

Today's planning

1. Repeat basic A (quiz)

2. Instruction basic B 

3. Get to work 

4. Closure 

Repeat A

What happens in the image on the left?

What is the adequate stimulus for the eyes?

What does a sensory organ produce once it picks up a stimulus?

If a stimulus does not go away for some time, it starts producing less impulses in the cell. What do we call this?

1. Adequate stimulus
2. Threshold value
3. impuls
4. habituation

What do we call the lowest intensity that can cause an impuls?

1. Adequate stimulus
2. Threshold value
3. impuls
4. habituation

Which diagram belongs to which stimulus?

A

B

C

Today's planning

1. Repeat basic A (quiz)

2. Instruction basic B 

3. Get to work 

4. Closure 

Remember the organ systems?

Learning goals 

• You can describe the structure and functions of the nervous system.
• You can describe the structure of nerve cells and nerves.
• (You can describe the pathway of an impulse from the sensory neuron to the interneuron and then to the motorneuron.)

Structure of the nervous system

Fill in the gaps 

...(1)... and ...(2)... are the components of the central nervous system. ...(3)... connect the central nervous system to all parts of the body.

Nerve cell

What does a neuron look like?

Structure of the nerve cell 

New words: 

1. Dendrites

2. Axon 

Fill in the gaps

The ...(1)... of a nerve cell contains the nucleus of the cell. The 

... (2)... receive the signal. ...(3)... can  pass the impulses to other nerve cells or to other cells. Some axons can be up to ...(4)... long. 

How long do you think one axon can be?

Today's planning

1. Repeat basic A (quiz)

2. Instruction basic B 

3. Get to work 

4. Closure 

Get to work!

Chapter 2, basic B - the nervous system

ex 1B & 2 

Done? Look up which three types of nerve cells exist 

(extra: What are their functions and do they look different from each other?)

Motor neuron

Interneuron

Sensory neuron

carries impulses inside the central nervous system

carries impulses from central nervous system to muscles or glands

receives impulses from sensory neurons or interneurons

Receives impulses from interneurons

receives impulses from sensory cells

brings impulses to the central nervous system

Get to work!

Chapter 2, basic B - the nervous system

ex 1B, 2 and 3 

What did you learn?

• ...about the structure and functions of the nervous system?
• ...about the structure of nerve cells?
• (... about the types of neurons and their functions?) 

What is a nerve?

Notes: 

nerve = a bundle of axons of nerve cells surrounded by a tough, protective layer

Today: finish senses B

On your table:

- closed MacBook

- notebook

- pensil case 

Planning 

Recap three types of neurons (including neuron-song)

Instruction on voluntary and involuntary responses

Make senses B ex. 4

Neuron pathway game 

3 types of nerve cells

notes: 

1. Sensory neurons: pass the impulses from the sense organs to the CNS

2. Motor neurons: pass impulses from the CNS to the muscle/glands

3. Interneurons: conduct impulses within the CNS

Voluntary response

This means you think about it first. You'll be conscious on the situation. 

Example: 

You see a friend and decide to wave. The impulse goes from your eyes to your brain: "Hey, it's my friend!" Your brain then sends an impulse to your arm and hand: "Wave hello!"

Involuntary response

This means you don't think about it. These are called reflexes.

Example: 

You see a bright light. Your eyelids close automatically to protect your eyes. This is a reflex too!

Get to work

Make senses B ex. 4. 

Not finished? Homework... :(

You can discuss with your neighbour.