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Block 1 ellen > Signalling in the body L12 > Flashcards

Signalling in the body L12 Flashcards

1
Q

direct signalling=

A

substances pass freely between adjacent cells through channels

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2
Q

intracrine signalling=

A

substances act within the cell

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3
Q

autocrine signalling=

A

substances act upon the cell that secreted it

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4
Q

juxtacrine signalling=

A

substances act upon adjacent cells

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5
Q

paracrine signalling=

A

substances act upon cells nearby (neurotransmitters)

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6
Q

endocrine signalling=

A

substances act upon cells throughout the body

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7
Q

neuron=

A

a nerve cell

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8
Q

nerve=

A

an enclosed cable-like bundle of axons

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9
Q

afferent neurons=

A

sensory

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10
Q

efferent neurons=

A

motor neurons

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11
Q

3 main parts of a neuron

A

dendrites
soma (cell body)
axons

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12
Q

3 neuron types

A

multipolar
bipolar
unipolar

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13
Q

what is neuroglia

A

supports the cells of the nervous system

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14
Q

motor unit=

A

muscle fibers innervated by the same motor neuron

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15
Q

myasthenia gravis=

A

antibodies against acetylcholine receptors

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16
Q

what does the soma do

A

integrates inputs and generates action potential

17
Q

what do dendrites do

A

receive input from other neurons

18
Q

what does the axon do

A

conveys output to other neurons

19
Q

structure of a nerve (layers) inner-outer (4)

A

endoneurium
fasciculus
perineurium
epineurium

20
Q

what does the endoneurium surround

A

individual nerve fibres

21
Q

what is a fasciculus

A

a bundle of nerve fibres surrounded by connective tissue

22
Q

what is the perineurium

A

the layer of connective tissue surrounding a fasciculus

23
Q

what is the epineurium

A

connective tissue sheath which surrounds each nerve

24
Q

botulinum toxin =

A

prevents neurosecretory vesicles from docking/ fusing with the nerve synapse at presynaptic terminal

25
Q

curare =

A

blocks nicotinic acetylcholine receptors at the postsynaptic terminal

Block 1 ellen (15 decks)

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