Download - The nervous system b1
![Page 1: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/1.jpg)
What is this lesson about?
![Page 2: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/2.jpg)
Coordination: The Nervous System
Learning Objectives: - Understand that different cells and tissues
must work together in the nervous system- To know the two systems of coordination in
mammals- Know the structure and function neurones
![Page 3: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/3.jpg)
Learning Flowchart:
Introduction to the two parts of the nervous system
Sensory Neuron function
How the nervous system worksReceptors + Density of touch receptors exp
Effectors in the body
Nerve and Neuron structure/function Video Summary
Picture Quiz
![Page 4: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/4.jpg)
The Nervous System
• Brain• Spinal cord• Nerves
• Enables you to control your body (Coordination)
• Gives you feedback about the world
What does it do?
What are its component parts?
Central Nervous System
Peripheral Nervous System
![Page 5: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/5.jpg)
Look away if you’re squeamish…
A dissected brain, spinal cord and sections of major nerves.
![Page 6: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/6.jpg)
How the nervous system works
STEP 1: ReceptorsReceptors are specialised cells. They can detect
changes in the environment (stimuli) and turn them into electrical impulses.
Receptor Stimuli
Skin
Tongue
Nose
Eye
Ear
![Page 7: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/7.jpg)
www.A6training.co.uk
Density of touch receptors Experiment
End
![Page 8: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/8.jpg)
How the nervous system works
STEP 2: A message is carried along a sensory neuron to
the CNS
![Page 9: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/9.jpg)
How the nervous system works
STEP 3: A message is sent from the CNS to an organ
(effector) via a motor neuron to carry out a response
Examples:• a muscle contracting to move the arm • a muscle squeezing saliva from the salivary
gland
![Page 10: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/10.jpg)
The Cells of the Nervous System - Neurones
![Page 11: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/11.jpg)
Nerves and NeuronesNerves are collections of long thin nerve cells
called neurones
Dendrite – Collects information from other cells
Axon – Fibre which carries information
Myelin Sheath – Electrical insulation
Nodes of Ranvier – Allow rapid conduction of impulses
![Page 12: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/12.jpg)
Nerve Impulses
Messages pass along neurons in the form of electrical impulses called action potentials
At the end of each neuron there is a tiny gap which impulses cross in one direction this is called a synapse
A chemical called neurotransmitterdiffuses across the gap
![Page 13: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/13.jpg)
http://www.brainpop.com/health/bodysystems/nervoussystem/
![Page 14: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/14.jpg)
Effector, Receptor or Neurone
![Page 15: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/15.jpg)
Effector, Receptor or Neurone
![Page 16: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/16.jpg)
Effector, Receptor or Neurone
![Page 17: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/17.jpg)
Effector, Receptor or Neurone
![Page 18: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/18.jpg)
Effector, Receptor or Neurone
![Page 19: The nervous system b1](https://reader036.vdocuments.us/reader036/viewer/2022081603/55852027d8b42aea748b4c58/html5/thumbnails/19.jpg)
Effector, Receptor or Neurone