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Flashcards in Cell Biology of Nervous System Deck (65)
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31

what are synapses

specialised intercellular gaps

32

what are the types of synapse

neuron - neuron axodendritic
neuromuscular junctions

33

what is the axon end bulb

the site of chemical neurotrans release

34

what is anterograde and retrograde movement

anterograde - from cell body down microtubules to end synapse
retrograde- back to axon

35

what moves with anterograde trans

neurotransmitters

36

what moves with retrograde trans

mito, dammaged mem to cell body

37

how do synapse vesicles throw out contents

exocytosis

38

what does each vesicle add to the presynaptic membrane

tiny lumps add to membrane not good if too much

39

what are the stages of vesicle secretion

vesicle tether to membrane then dock then fuse nd release

40

how are membranes recycled

using clatheri baskets

41

what process does clatherin baskets use to recycle excess membrane

endocytosis

42

what kind of movement does the clatherin basket use

retrograde movement

43

what is the other method of preventing too much build of presyn mem

kiss and run

44

what is the kiss and run method

the vesicle docks an releases some product but not all. then closes and vesicle leaves

45

which method has a larger peak of product

fully docking and release not kiss and run

46

how are th dendrites described

as a dendritic tree as process branch

47

what does more dendritic spines mean

more interaction with surrounding cells

48

what happens with repeated stimulation to dendrite

modification of dendritic spines

49

what s modification of dendritic spines called

long term potentiation

50

what is long term potentiation an example of

learning in the CNS

51

what doe myelin do

facilitate conduction as is an insulating coat

52

what si myelin structure along the axon like

wraps around th axon in internodes with discontinuous nodes of ranvier between internodes

53

whats the difference of the myelination of the CNS and PNS

CNS - oligodendrocyte 1:many
PNS - Schwan cells 1:1

54

what is an astrocyte

star like
strutural, metabolic, mechanical support of neurons

55

what is and oligodendrocyte

myelination of axons in CNS

56

what is microglia

aka macrophages
scavengers that phagocytose foreign matter

57

what are perivascular cells

similar to microglia but near blood vessels

58

what are schwann cells

myelination and trophic support of PNS
also involved in growth and repair

59

what are activated T lymphocytes

enter CNS for surveillance ensuring only 'self' cells

60

what are ependymal cells

line cavities , modified epithelia