The nervous system & the reflex arc

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 3,4

Unit: Sense it!

Lesson outline: 3 interactive video's about 5-8min each incl MC questions.

Aims:

- Outline the CNS, PNS

- describe three types of neurones

- compare hormonal and neural regulation

- describe a reflex arc pathway and outline the significance from an evolutionary perspective

Dendrite

Cytoplasm

Nucleus

Axon

Myelin sheath

Synapse

Electric impuls

The message is:

- is super fast 

- called impulses (electrical signals)

- goes via the axon of the nerve cell

- has fatty sheat: myelin sheath around axons make the impuls travel faster

sensory neuron

• passes impulses from sensory organ to central nervous system
• cell body outside of central nervous system

S

interneuron

• Passes impulses from other nerve cells
• No long axons
• Only found inside central nervous system

I

motor neuron

• Passes impulses from central nervous system to muscle/gland
• Cell body on the end in the central nervous system

M

Types of nerve cell

Motor Neuron

Inter neuron

Sensory neuron

Found in visual system, brain, and spinal cord, pass informatiion on

carry electrical impulses away from the brain and spinal cord

Take information from sense organs to the brain and spinal cord

00:19

Which two organ systems coordinate these responses and behaviors (homeostasis)?

1. circulatory system
2. muscular system
3. endocrine system (hormones glands)
4. nervous system

01:02

How is the nerve cell adapted to it's function?

1. long body
2. thin body
3. branched ends (synapses)
4. all of the above

02:02

Components of the CNS (central nervous system)

1. skull
2. peripheral nerves
3. brain
4. spinal cord

02:11

Examples of sensory information are

1. body temperature
2. body posture
3. all answers are correct
4. light/sound

02:47

Sensory nerves receive stimuli through sensors (sense organs)

1. true
2. false

02:49

Motor neurones send electrical impulses to effectors

1. true
2. false

01:06

What is the function of a motor neurone?

1. all answers are correct
2. pass information to effectors
3. pass information to glands
4. pass information to muscles

02:09

What is the name of the nerve endings (close to these gaps)?

1. sonopsis
2. synaps
3. synapsis
4. neurotransmitter

02:26

What type of nerve cell is seen on the left in this example? How do you know this?

1. sensory neurone, it has long dendrites and axon
2. motor neurone, it has one long axon and short dendrites

02:49

What is the name of the neurone in the middle?

1. relay neuron
2. intermediate neuron
3. all are correct
4. inter neuron

02:51

In which part of the nervous system are relay neurones found?

1. CNS Central Nervous System
2. PNS Peripheral nervous system

Reflex arc 

Workbook

Finish page 13 and 14

01:08

Aims:

You need to understand what a reflex pathway is, how it works and be able to apply this knowledge in an example.

01:32

Write down in your notebook: 

Reflex arc = 

unconscious response to a stimulus (stimulus does initially not reach the brain)

01:48

Last question: select the correct reflex arc pathway

1. motor -> relay -> sensory
2. sensory -> relay -> motor
3. sensory -> relay -> brain -> motor
4. sensory -> motor

What I do not understand / questions I have about the content are:

The end of the lesson