Label the Neuron
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1. With the help of figure 12.6 on page 395 and the definitions below, label the following diagram of a typical neuron.
|axon - the long extension of a neuron that carries |myelin sheath - the fatty substance that surrounds and protects some nerve fibers |
|nerve impulses away from the body of the cell. |node of Ranvier - one of the many gaps in the myelin sheath – impulses jump from |
|axon terminals - the hair-like ends of the axon |node to node resulting in faster transmission |
|cell body - the cell body of the neuron; it contains |nucleus - the organelle in the cell body of the neuron that contains the genetic |
|the nucleus and other cell organelles |material of the cell |
|dendrites - the branching structure of a neuron that |Schwann's cells - cells that produce myelin - they are located within the myelin |
|receives messages (attached to the cell body) |sheath. |
2. Place an arrow along the diagram to indicate the direction that impulses travel long the neuron.
3. What type of nerve cell would carry impulses from the scent receptors in your nose to your brain?
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4. What type of nerve cell would carry messages from your brain to the muscles in your leg?
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