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Neuromuscular junction: Quiz

  

Question 1: The action of acetylcholine is terminated when the enzyme ________ degrades the neurotransmitter and the unhydrolysed neurotransmitter diffuses away.
Choline acetyltransferaseButyrylcholinesteraseIbogaineAcetylcholinesterase

Question 2: This influx of Ca2+ causes neurotransmitter-containing vesicles to dock and fuse to the presynaptic neuron's ________.
Vesicle (biology)Cell nucleusCell (biology)Cell membrane

Question 3: Acetylcholine diffuses into the synaptic cleft and binds to the ________ bound to the motor end plate.
Alpha-4 beta-2 nicotinic receptorAlpha-3 beta-4 nicotinic receptorNicotinic acetylcholine receptorAlpha-7 nicotinic receptor

Question 4: These receptors are ________, and when they bind acetylcholine, they open, allowing sodium ions to flow in and potassium ions to flow out the muscle's cytosol.
Sodium channelLigand-gated ion channelPotassium channelGeneral bacterial porin family

Question 5: In vertebrates, the signal passes through the neuromuscular junction via the neurotransmitter ________.
KetamineKynurenic acidAcetylcholineDextromethorphan

Question 6: MuSK is a receptor tyrosine kinase - meaning that it induces cellular signaling by causing the release of ________ molecules to particular tyrosines on itself, and on proteins which bind the cytoplasmic domain of the receptor.
PhosphateAdenosine triphosphatePhosphorusPhosphate homeostasis

Question 7: Because of the differences in electrochemical gradients across the plasma membrane, more sodium moves in than potassium out, producing a local depolarization of the motor end plate known as an ________ (EPP).
Nervous systemEnd-plate potentialExcitatory postsynaptic potentialHuman physiology

Question 8: Upon the arrival of an ________ at the presynaptic neuron terminal, voltage-dependent calcium channels open and Ca2+ ions flow from the extracellular fluid into the presynaptic neuron's cytosol.
Chemical synapseIon channelPhotoreceptor cellAction potential
















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