BMS1032 Neurology


?
A cluster of neuronal cell bodies in the PNS is known as:
ganglion
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The somatic motor neurons control:
skeletal muscle
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which feature is not present in a neurone?
cell wall
3 of 51
synapses can be electrical and chemical?
true
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non-excitable support cells are known as:
glial cells
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Dendrites are:
processes of a neurone that receive incoming signals
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intracellular ion concentration is high for?
K+
7 of 51
resting potential of -70mV is achieved by:
K+ ions leaking through ion channels into extracellular space
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The Na+ gate is:
Voltage-gated
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Na+ entry into the cell is an example of:
positive feeback (once one opens the depolarisation causes more to open)
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when the cell reaches +30mv...
the Na+ gates close via inactivation
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The increased permeability to K+ causes the cell to:
hyperpolarise
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no AP can be generated during the:
absolute refractory period
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Conduction of an AP occurs at the:
axon hillock
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which is incorrect about myelin sheathed neuronal conduction?
is slower than that of unmyelinated cells
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Myelinated cells of medium diameter that conduct at a speed of 15m/sec are features of which fibre?
B fibres
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The depolarisation of presynaptic terminals trigger...
voltage gated Ca2+ channels to open
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Ca2+ influx causes:
neurotransmitter vesicles to fuse and release contents into synaptic cleft
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NT binds to what type of receptor on the postsynaptic membrane?
Ligand-gated ion channal
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acetylcholine binds to which receptors on skeletal muscle?
nicotinic
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Electrical synapses pass through which cell junction?
gap
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Neuromuscular junctions synapse between:
motor neurones and skeletal muscle cells
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One motor neurone and all the muscle fibres it innervates is known as:
a motor unit
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which neurotransmitter is released from motor neuron terminals?
Acetylcholine
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Postsynaptic potentials generated by the activation of nicotinic receptors are:
end plate potentials
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What is Ca2+ role in muscle contraction?
binds to troponin, causing the shift in tropomyosin to expose myosin binding sites
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during muscle contraction when ATP is hydrolysed:
myosin heads return to the resting position
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Ca2+ is released from ______ when an AP passes down the ______?
sarcoplasmic reticulum and T-tubule
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The ANS stimulates which effectors?
smooth/cardiac muscle and glands
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parasympathetic systems are responsible for:
rest and digest
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the sympathetic pathway originated from:
a chain of ganglia
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The hypothalamus is the control centre for which nervous system
ANS
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post ganglia neurones of the sympathetic afferent pathway release which NT?
noradrenaline
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Ach released from postganglionic neurones in the parasympathetic pathway binds to:
muscarinic receptors
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A monosynaptic spinal reflex consists of:
a sensory neuron and a motor neuron
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In the spine grey matter is made from:
cell bodies of neurons, neuroglia and unmyelinated axons
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The polysynaptic pathway in the patellar tendon reflex:
causes the muscle to relax and inhibits movement
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Excitatory interneurons:
relay excitation in withdrawal reflexes and crossed extensor reflex
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Which receptor type detects pressure stimuli
mechanoreceptors
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Pressure, vibration and deep touch is detected via:
encapsulated nerve endings
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Tonic/slow adapting receptors:
continue as long as the stimulus persists
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when a sensory receptor membrane depolarises, the change in membrane potential is:
receptor potential
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the sensory pathway for fine touch is:
the medial lemniscus pathway
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A delta fibres are NOT:
unmyelinated
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pain can be modulated via:
touch/non painful stimuli
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the centre for equilibrium and movement coordination is in the:
cerebellum
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The hippocampus is responsible for?
explicit and spatial memory
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the primary motor cortex is in the:
frontal lobe
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whats the difference between lateral and anterior corticospinal tracts?
only the lateral crosses over
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the control and refinement of movement occurs in the:
basal ganglia
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loss of function to basal ganglia causes:
parkingsons
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Other cards in this set

Card 2

Front

The somatic motor neurons control:

Back

skeletal muscle

Card 3

Front

which feature is not present in a neurone?

Back

Preview of the front of card 3

Card 4

Front

synapses can be electrical and chemical?

Back

Preview of the front of card 4

Card 5

Front

non-excitable support cells are known as:

Back

Preview of the front of card 5
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