Nervous System

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Nervous System
2011-10-09 23:08:44

The Nervous System
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  1. What are the three types of neurons?
    Sensory- Takes impulses from sensory receptors to CNS Interneurons- Recives information in the CNS and send it to a motor neuron Motor- Takes impulses from the CNS to an effector ( i.e gland or muscle fiber)
  2. What are neurogelia ?
    Secondary cells of the nerveous system. A cell type that divides. Most brain tumors involve the neurogelia cells. > Neuron the the primaray cell
  3. What is the structure of a neuron?
    Cell bodyDendrites: Carry impulses towards the cell body Axons: transmit the impulse away from the cell bo
  4. Explain the resting and action potential as they relate to a nerve inpulse.
    Resting potential (RP) occurs when the axon is not conducting a nerve inpulse ( sleeping is one example) More positive ions are outside than inside the nerveous system. There is negative charge or -65mv inside the axon. More Na+ outside than inside. More K+ inside than outside.
  5. How does the nerve inpulse traverse the synapse?
    Nerve inpulse reaches the axon terminal. Calcium ions enter the axon terminal that stimulate the synaptic vesicles to fuse with the presynaptic membrane. Neurotransmitters are released and diffused across the synapse and bind with the posynaptic membrane to inhibit exite the neuron.
  6. What are the two parts of the CNS ?
    The brain and spinal cord