nervous tissue Flashcards

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1
Q

resting potential

A

neurone that isnt transmitting an action potential and is at rest
when neurone at rest it is negativelly chargd inside

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2
Q

speed of action potential

A

faster when axon diameter is bigger
nerve impulse travelles quicker if neurone is myelinated
fewer synapses to cross = quicker

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3
Q

what are neurones

A

cells that recieve and facilitate nerve impulses across their membrane and onto the next neurone

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4
Q

what consists in a neurone

A

dendrites, cell body (soma), nucleus, axon terminals, node of ranvier, myelin sheath, shwan cells, axon

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5
Q

nerve impulse

A

ionic imbalances that travel from one neurone to another

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6
Q

what deos resting potential of -70mV mean

A

the sodium-potassium channels are pumping sodium to the outside of the cell and potassium to the inside of cell

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7
Q

what is depolarization

A

when the positive sodium atoms flood into the call causing the restng potential to decrease

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8
Q

what is repolarization

A

at +40mV, the na channels close and the k channels open causing the charge of the cell to go back down

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9
Q

how does a signal get from one neurone to the other

A

action potential cannot just cross the synapse, so as it reaches the end of neurone na channels get opened, this makes vesicles containing neurotransmitters to fuse with the presynaptic membrane and crosss the synapse where they bind to receptors in the postsynaptic membrane.

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10
Q

how do we stop the signal

A

either they get reabsorbed into the neurone or an enzyme breaks them down

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11
Q

what do neurotransmitters cause after crossing the synapse

A

initiate action potential in the other neurone, as presynaptic neurone ends in a swelling called ‘synaptic bulb’ and contains many mitochondria as atp is needed

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12
Q

where are the neurotransmitters stored before releases across the synapse

A

in teporary vesicles in the synaptic bulb

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