5.3 Neuronal Communication Flashcards
What sensory receptor detects a change in light intensity?
rods and cones in retina
What sensory receptor detects a change in temperature?
hypothalamus and skin
What sensory receptor detects a change in pressure on skin?
Pacinian corpuscle
What sensory receptor detects a change in sound?
cochlea in ear
What sensory receptors detect a change in movement?
hairs in inner ear
What sensory receptors detect a change in lenght of muscle
muscle spindles in skeletal muscles
What sensory receptors detect a change in chemicals in the air?
olfactory cells in nose
What sensory receptors detect a change in food?
chemical receptors in taste buds
What is it called when sodium ions enter a cell from pressure on a pacinian corpuscle?
generator potential
How many sodium and potassium ions pass throguh the pump?
3 Na out and 2 K in
What happens when there is a larger stimulus to the sodium channels?
more open
Draw a motor neuron
key feature :
- cell body with dendrites around
- dendrites to axon transmission
- nodes of ranvier
- has an axon
Draw a sensory neuronwh
key features:
- seperate cell body
- synaptic endings at acon
- dendron is a full thing
draw a relay neuron
short
What is myelin made of?
schwan cells
what is the movement down a myelinated cell called?
saltatory propogation
stages of an action potential
- more NA ions out of cell, more K in
- sodium ion channels open
- depolarisation to threshold value (-50mv)
- voltage gated sodium channels open
- reaches +40mv
- Na channels close and K open
- K ions diffuse out
- overshoots and becomes hyperpolarised
- original restored
what is the all or nothing law ?
same intensity
what are synapses that use acetylcholine called?
cholinergic synapses
what is the enzyme called that is for acetylcholine?
acetylcholinesterase
what does acetylcholinesterase do?
converts acetylcholine into ethanoic acid and choline
what is an EPSP
Excitatory Post Synaptic Potential
when is summation reached?
when there is more than on EPSP
What is it called when summation occurs from one pre-synaptic neuron?
temporal summation
What is it called when summation occurs from more than one pre synaptic neuron?
spatial summation
What is an IPSP
inhibtory post-synaptic potential
