A&P Lect 3 part 1

The flashcards below were created by user rwischnewski on FreezingBlue Flashcards.

  1. difference between afferent and efferent?
    afferent- going toward CNS

    efferent- going away from CNS
  2. anatomy of a neuron?
    dendrite- some- trigger zone- axon- synaptic knob
  3. three fundamental properties of nerve cells?
    excitability, conductivity, secretion
  4. function of a neuron's trigger zone?
    to sum up local graded potentials
  5. function of ependymal?
    CSF production and circulation
  6. function of microglia?
    immune cells
  7. function of oligeodendrocytes?
    myelin sheathes for CNS
  8. function of astrocytes?
    • form scaffolding of CNS
    • provide nutrients and growth factors to neurons
    • take up wastes and neurotransmitters
    • provide frame to direct nerve growth during development and new synapse formation after birth
    • attach to capillaries to tighter them into a blood- brain barrier
  9. myelin?
    a wrap of cell membrane around an axon that speeds transmission of an action potential and allows axons to regenerate
  10. saltatory conduction?
    the action potentials have a skipping
  11. describe nerve regeneration?
    • old schwann cells produce growth factors that cause the axon to elongate
    • new schwann cells wrap the axon as it grows
    • can only occur in peripheral axons
  12. steps leading to an action potential in a neuron?
    • neurotransmitters bind to ligand-gated channels
    • open channels allow ions to enter cell causing a change in resting membrane potential locally 
    • local changes are summed up at the trigger zone
    • if the sum reaches threshold, voltage gated sodium channels open sequentially down the axon 
  13. types of neurotransmitters?
    • acetylcholine
    • monoamines
    • amino acids
    • neuropeptides
    • lipids
  14. where are neurotransmitters made?
    made in the soma of each neuron
  15. how are they (neurotransmitters) released?
    they are discharged from their transport vesicles at the synaptic knob by the interaction with calcium.
  16. how are they (neurotransmitters) they degraded?
    diffusion, re-uptake by presyanptic cell, uptake by astrocyte, enzyme degradation
  17. what do they (neurotransmitters) do?
    bind to receptors on the  membrane of the post synaptic cell
  18. three types of membrane channels involved in routine action potential?
    • ligand- gated sodium channel
    • voltage- gated sodium channel
    • voltage- gated calcium channel
  19. type of membrane protein involved in an adrenergic synapse?
    a second messenger membrane protein
  20. convergent synapses?
    one post neuron receives input from three pre-synaptic neurons
  21. divergent synapses?
    three post, synaptic neurons receive input from pone pre-synaptic neuron
Card Set
A&P Lect 3 part 1
Show Answers