Upload
wendy-spencer
View
222
Download
0
Embed Size (px)
Citation preview
The neurone
Learning objectives:• Explain how the neurone is adapted for
its function
• Label a neurone using key words e.g. axon, mylein sheath, dendrites
• Describe the role of a neurone/nerve cell in the nervous system. Name three examples of neurone
• Explain how the neurone is adapted to its function
Learning Outcomes
Think – Pair – Share
Elicit
How is this cell the same as an animal cell? Different to an animal cel?
The brain can respond to touch, smell or taste stimuli in just 0.1 seconds, but sound and vision take longer.
How fast are electrical signals?
Nerve impulses travel at up to 320
mph and take just0.02 seconds to reach the brain.
InitiateEngage
What are neurones? Neurones are specialized cells that conduct electrical impulses through the body.
nerve fibre
A nerve is a bundle of many nerve fibres enclosed within a protective sheath. Nerve fibres are the long axons of neurones together with any associated tissues.
nerve
Make a model neurone
- work in groups of 4
- use the resources available to create a poster and model
- you will be judged according to our success criteria:
1) Scientific accuracy of model and explanation of how it is adapted for its function
2) Aesthetic appearance
3) Teamwork
Explore
Team number
1 2 3 4 5 6 7 8
Scientific accuracy
Aesthetic appearance
Teamwork
Total
3 = excellent 2 = good 1 = satisfactory
What do neurones look like?
The axons of most neurones are wrapped in an insulating lipid layer called the myelin sheath. Why is this important?
Thin projections called dendrites extend from the cell body and connect with other neurones, allowing electrical impulses to pass from one to the other.
Neurones are elongated cells consisting of a cell body and long, thin axon.
myelin sheath
axon
cell body
dendrites
Explain
What are sensory neurones?Sensory neurones transmit messages from sense receptors, such as the eye or nose, to the brain or spinal cord.
cell body
nerve impulse from sense organ
nerve impulse to CNS
What are motor neurones?Motor neurones transmit messages from the brain and spinal cord to the muscles and glands.
cell body
muscle
Neurones link receptor cells to effector cells.
Label the neurone- Summarising what you have learnt. Write down how it is adapted to its function
Elaborate-demonstrate learning
Dendrite
Nucleus
Nerve EndingAxon
Cell Membran
e
Cytoplasm
The cytoplasm is shaped into a long axon to transmit electrical impulses between central nervous system and effector
Fatty sheath acts as an electrical insulator of the axons, and speed up transmission of electrical impulses.
Branched endings make connections with other neurons or effectors.
Self assess
• http://www.bbc.co.uk/news/uk-wales-south-east-wales-15005209
• http://www.youtube.com/watch?v=YUWbzNEoPI8&feature=related (Very emotive)
• http://www.youtube.com/watch?v=m-zuoFtQzfw&feature=related
• http://www.youtube.com/watch?v=s0i8NhFKj14
• http://www.nhs.uk/conditions/Motor-neurone-disease/Pages/Introduction.aspx
The Nervous System – Interactive activity
Extend
• Label a neurone using key words e.g. axon, mylein sheath, dendrites
• Describe the role of a neurone/nerve cell in the nervous system. Name three examples of neurone
• Explain how the neurone is adapted to its function
Learning Outcomes
Evaluate