action potential ext

Question 1

Does the stimulus strength effect the size of the impulse?

Answer 1

no, size of impulse always the same regardless of size of stimulus (same action potential)
however, stronger stimuluses depolarises more nerve fibres in a given time

Question 2

myelinated fibres

Answer 2

nerves that are insulated from extracellular fluid except at nodes (myelin sheath)

Question 3

ions in myelinated sheath

Answer 3

ions cannot flow between inside and outside so action potential cannot form

Question 4

saltatory conduction

Answer 4

jumping from node to node

Question 5

neuron to neuron

Answer 5

adjacent neurons dont touch

Question 6

synapses

Answer 6

junction between branches of neurons

Question 7

neuromuscular junction

Answer 7

gap between axon and muscle

Question 8

journey from neutron to neuron

Answer 8

axon terminal -> presynaptic neuron ->synaptic cleft -> postsynaptic neuron

Question 9

what neurotransmitters diffuse across membrane

Answer 9

acetylcholine, adrenaline, dopamine and histamine