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The Nervous System

The Nervous System. Define the following terms:. Nerve system Receptor Stimulus Neuron. Impluses Effector Brain Synapse. In paragraph/diagram form, explain how all these terms are related to one another. Draw a neuron and label the following parts:. Cell body Nucelus Axon

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The Nervous System

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  1. The Nervous System

  2. Define the following terms: • Nerve system • Receptor • Stimulus • Neuron • Impluses • Effector • Brain • Synapse • In paragraph/diagram form, explain how all these terms are related to one another.

  3. Draw a neuron and label the following parts: • Cell body • Nucelus • Axon • Schwann Cell • Synaptic Knobs

  4. To Do: • Explain the difference between nerves, sensory neurons, motor neurons, and interneurons.

  5. Protists • Lack nervous system • Respond to stimuli in a co-ordinated way • Not totally understood, but are able to tell diff. b/n light/harmful chemicals, food/nonfood. • Amoeba Feeds! http://www.youtube.com/watch?v=W6rnhiMxtKU

  6. Hydra • Has a nerve net • Nerve cells form irregular network b/n 2 layers of body wall • Impulses cause muscles to respond • E.g. Tentacle touches food  impulse travels through organism  animal stretches towards food  tentacles capture food and stuff into mouth • http://www.youtube.com/watch?v=Zgp7cutpO8o&feature=related

  7. Earthworm • More complex nervous system • Divided into the central and peripheral system • Central: brain + ventral nerve cords • Peripheral: nerves branching to all parts of body • Has motor neurons (carry impulses from nerve cords to muscles) and sensory neurons (impulses from receptors in skin to nerve cords)

  8. Grasshopper • Similar to the earthworm • Made of brain, ventral nerve cord, ganglia (group of cells that co-ordinate impulses) • Sense organs are better developed • Has eyes (antennae) or feelers, taste organs, and are sensitive to sound

  9. To Do: • Summarize in your notes how the nervous system increases in complexity from the protists to the grasshopper. (Can draw a diagram if it is helpful to you)

  10. Human Nervous System • Made up of the central and peripheral system • Central: made of brain, spinal cord, interneurons, and motorneurons. Controls most activities of the body • Peripheral: network of nerves, conduct impulses b/n central nervous system & receptors/effectors of the body

  11. To Do: • Draw a concept map of the brain explaining the 3 main parts and the functions they control • Outline the 2 main functions of the spinal cord. http://www.youtube.com/watch?v=udaCEBtqfb (~ 4 to 10 minutes) • Explain what a reflex is and the process that happens when you touch something hot and your hand withdraws.

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