High‑school/pre‑med level questions on neuron structure, resting potential, action potentials, synapses, neurotransmitters, and myelination.
Which structure typically carries action potentials AWAY from the cell body of a neuron?
Source: entermedschool.org
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src="https://entermedschool.org/embed/questions#{"title":"Action Potentials, Neurons & Neurotransmission","questions":[{"prompt":"Which structure typically carries action potentials AWAY from the cell body of a neuron?","options":[{"label":"A","body":"Dendrite","isCorrect":false},{"label":"B","body":"Axon","isCorrect":true},{"label":"C","body":"Nucleus","isCorrect":false},{"label":"D","body":"Ribosome","isCorrect":false},{"label":"E","body":"Myelin sheath","isCorrect":false}],"explanation":"Dendrites usually receive signals; the axon conducts action potentials away from the cell body towards synaptic terminals."},{"prompt":"The small gaps between segments of myelin along a myelinated axon are called:","options":[{"label":"A","body":"Synaptic clefts","isCorrect":false},{"label":"B","body":"Nodes of Ranvier","isCorrect":true},{"label":"C","body":"Dendritic spines","isCorrect":false},{"label":"D","body":"Axon hillocks","isCorrect":false},{"label":"E","body":"Boutons","isCorrect":false}],"explanation":"Nodes of Ranvier are gaps in the myelin sheath where voltage‑gated ion channels are concentrated and action potentials are regenerated."},{"prompt":"At rest, the membrane potential of a typical neuron is approximately:","options":[{"label":"A","body":"+70 mV (inside positive)","isCorrect":false},{"label":"B","body":"-70 mV (inside negative)","isCorrect":true},{"label":"C","body":"0 mV (no difference)","isCorrect":false},{"label":"D","body":"+30 mV (inside positive)","isCorrect":false},{"label":"E","body":"-120 mV (inside very negative)","isCorrect":false}],"explanation":"The resting membrane potential is typically around −70 mV, with the inside of the neuron negative relative to the outside."},{"prompt":"Which statement correctly compares ion concentrations INSIDE and OUTSIDE a typical resting neuron?","options":[{"label":"A","body":"Na+ is higher inside; K+ is higher outside","isCorrect":false},{"label":"B","body":"Na+ is higher outside; K+ is higher inside","isCorrect":true},{"label":"C","body":"Both Na+ and K+ are higher outside","isCorrect":false},{"label":"D","body":"Both Na+ and K+ are higher inside","isCorrect":false},{"label":"E","body":"There is no difference in ion concentrations","isCorrect":false}],"explanation":"At rest, extracellular fluid has high Na+ and low K+; the cytoplasm has high K+ and low Na+."},{"prompt":"The Na⁺/K⁺ pump (sodium–potassium ATPase) in neurons moves ions in which directions per ATP hydrolysed?","options":[{"label":"A","body":"3 Na⁺ in, 2 K⁺ out","isCorrect":false},{"label":"B","body":"3 Na⁺ out, 2 K⁺ in","isCorrect":true},{"label":"C","body":"2 Na⁺ out, 3 K⁺ in","isCorrect":false},{"label":"D","body":"Na⁺ and K⁺ both out","isCorrect":false},{"label":"E","body":"Na⁺ and K⁺ both in","isCorrect":false}],"explanation":"The pump actively exports 3 Na⁺ and imports 2 K⁺ per ATP, helping maintain ion gradients and a negative resting potential."},{"prompt":"During the rising phase (depolarisation) of a typical action potential, which main event occurs?","options":[{"label":"A","body":"Voltage‑gated K⁺ channels open and K⁺ rushes out","isCorrect":false},{"label":"B","body":"Voltage‑gated Na⁺ channels open and Na⁺ rushes in","isCorrect":true},{"label":"C","body":"Na⁺/K⁺ pumps shut down completely","isCorrect":false},{"label":"D","body":"Cl⁻ channels open and Cl⁻ rushes in","isCorrect":false},{"label":"E","body":"Myelin sheaths are destroyed","isCorrect":false}],"explanation":"Depolarisation is caused mainly by Na⁺ influx through voltage‑gated Na⁺ channels."},{"prompt":"Which best describes REPOLARISATION during an action potential?","options":[{"label":"A","body":"Opening of Na⁺ channels and closing of K⁺ channels","isCorrect":false},{"label":"B","body":"Opening of voltage‑gated K⁺ channels, allowing K⁺ to leave the cell","isCorrect":true},{"label":"C","body":"Massive entry of Ca²⁺ into the cell body","isCorrect":false},{"label":"D","body":"Sudden shutting of all ion channels","isCorrect":false},{"label":"E","body":"Inactivation of all Na⁺/K⁺ pumps","isCorrect":false}],"explanation":"Repolarisation follows depolarisation and is mainly due to K⁺ efflux through voltage‑gated K⁺ channels."},{"prompt":"The 'all‑or‑nothing' principle of the action potential means that:","options":[{"label":"A","body":"The neuron can only fire once in its lifetime","isCorrect":false},{"label":"B","body":"If threshold is reached, an action potential of fixed amplitude occurs; if not, there is no action potential","isCorrect":true},{"label":"C","body":"Stronger stimuli produce larger amplitude action potentials","isCorrect":false},{"label":"D","body":"Neurons never have graded potentials","isCorrect":false},{"label":"E","body":"Action potentials can be half‑size when threshold is barely reached","isCorrect":false}],"explanation":"Above threshold, action potentials have stereotyped size; stimulus strength is encoded mainly by frequency, not amplitude."},{"prompt":"The threshold potential at which a neuron usually fires an action potential is typically around:","options":[{"label":"A","body":"0 mV","isCorrect":false},{"label":"B","body":"-90 mV","isCorrect":false},{"label":"C","body":"-55 mV","isCorrect":true},{"label":"D","body":"+30 mV","isCorrect":false},{"label":"E","body":"-10 mV","isCorrect":false}],"explanation":"Many neurons fire when the membrane potential depolarises from about −70 mV to around −55 mV."},{"prompt":"The refractory period of a neuron is important because it:","options":[{"label":"A","body":"Prevents any further action potentials ever from occurring","isCorrect":false},{"label":"B","body":"Allows action potentials to travel in only one direction along the axon","isCorrect":true},{"label":"C","body":"Increases the amplitude of action potentials","isCorrect":false},{"label":"D","body":"Is when neurotransmitter is synthesised","isCorrect":false},{"label":"E","body":"Stops the Na⁺/K⁺ pump permanently","isCorrect":false}],"explanation":"During the refractory period, recently opened Na⁺ channels are inactivated, making it harder or impossible to fire again, ensuring one‑way propagation."},{"prompt":"Which statement about MYELINATION is TRUE?","options":[{"label":"A","body":"Myelin increases the amplitude of each action potential","isCorrect":false},{"label":"B","body":"Myelin prevents action potentials from occurring at all","isCorrect":false},{"label":"C","body":"Myelin increases the speed of conduction along the axon","isCorrect":true},{"label":"D","body":"Myelin is mainly found on dendrites","isCorrect":false},{"label":"E","body":"Myelin changes the direction of action potentials","isCorrect":false}],"explanation":"Myelin acts as an electrical insulator, allowing saltatory conduction and greatly increasing conduction velocity."},{"prompt":"Saltatory conduction refers to:","options":[{"label":"A","body":"Action potentials that are continuously regenerated along every nanometer of the axon","isCorrect":false},{"label":"B","body":"Action potentials that appear to 'jump' from node of Ranvier to node of Ranvier along a myelinated axon","isCorrect":true},{"label":"C","body":"Action potentials that move equally in both directions","isCorrect":false},{"label":"D","body":"The failure of action potentials in myelinated axons","isCorrect":false},{"label":"E","body":"The opening of chemical synapses","isCorrect":false}],"explanation":"In myelinated axons, depolarisation spreads rapidly under the myelin and is regenerated only at nodes, giving the 'jumping' pattern."},{"prompt":"Which of the following would generally INCREASE the speed of action potential conduction along an axon?","options":[{"label":"A","body":"Decreasing axon diameter and removing myelin","isCorrect":false},{"label":"B","body":"Increasing axon diameter and adding myelin","isCorrect":true},{"label":"C","body":"Increasing membrane resistance by blocking all ion channels","isCorrect":false},{"label":"D","body":"Reducing the number of nodes of Ranvier to zero","isCorrect":false},{"label":"E","body":"Making the resting potential more positive without myelin","isCorrect":false}],"explanation":"Large diameter reduces internal resistance, and myelin reduces leak and supports saltatory conduction—both speed up transmission."},{"prompt":"Multiple sclerosis (MS) is an example of a disease where myelin in the central nervous system is damaged. Which effect would you expect?","options":[{"label":"A","body":"Faster conduction of nerve impulses","isCorrect":false},{"label":"B","body":"Slowed or blocked conduction along affected axons","isCorrect":true},{"label":"C","body":"Larger action potential amplitude","isCorrect":false},{"label":"D","body":"No change in neuronal function","isCorrect":false},{"label":"E","body":"Increased neurotransmitter synthesis","isCorrect":false}],"explanation":"Loss of myelin disrupts saltatory conduction, slowing or blocking action potentials and causing neurological symptoms."},{"prompt":"At a chemical synapse, which ion's entry into the presynaptic terminal directly triggers vesicle fusion and neurotransmitter release?","options":[{"label":"A","body":"Na⁺","isCorrect":false},{"label":"B","body":"K⁺","isCorrect":false},{"label":"C","body":"Ca²⁺","isCorrect":true},{"label":"D","body":"Cl⁻","isCorrect":false},{"label":"E","body":"Mg²⁺","isCorrect":false}],"explanation":"Depolarisation at the terminal opens voltage‑gated Ca²⁺ channels; Ca²⁺ influx triggers synaptic vesicle fusion."},{"prompt":"The small gap between a presynaptic neuron and a postsynaptic cell at a chemical synapse is the:","options":[{"label":"A","body":"Axon hillock","isCorrect":false},{"label":"B","body":"Node of Ranvier","isCorrect":false},{"label":"C","body":"Synaptic cleft","isCorrect":true},{"label":"D","body":"Myelin gap","isCorrect":false},{"label":"E","body":"Voltage gap","isCorrect":false}],"explanation":"The synaptic cleft is the extracellular space into which neurotransmitters are released."},{"prompt":"Which neurotransmitter is released at the neuromuscular junction in vertebrates and stimulates skeletal muscle contraction?","options":[{"label":"A","body":"GABA","isCorrect":false},{"label":"B","body":"Glutamate","isCorrect":false},{"label":"C","body":"Acetylcholine (ACh)","isCorrect":true},{"label":"D","body":"Dopamine","isCorrect":false},{"label":"E","body":"Serotonin","isCorrect":false}],"explanation":"Motor neurons release ACh onto muscle fibre receptors, causing depolarisation and contraction."},{"prompt":"Which is the main inhibitory neurotransmitter in the BRAIN of most vertebrates?","options":[{"label":"A","body":"Glutamate","isCorrect":false},{"label":"B","body":"Acetylcholine","isCorrect":false},{"label":"C","body":"GABA","isCorrect":true},{"label":"D","body":"Dopamine","isCorrect":false},{"label":"E","body":"Noradrenaline","isCorrect":false}],"explanation":"GABA (gamma‑aminobutyric acid) is the principal inhibitory neurotransmitter in the CNS."},{"prompt":"Which is the main excitatory neurotransmitter in the BRAIN?","options":[{"label":"A","body":"Glutamate","isCorrect":true},{"label":"B","body":"GABA","isCorrect":false},{"label":"C","body":"Glycine","isCorrect":false},{"label":"D","body":"Dopamine","isCorrect":false},{"label":"E","body":"Serotonin","isCorrect":false}],"explanation":"Glutamate is the major excitatory neurotransmitter in the CNS."},{"prompt":"Dopamine, serotonin and noradrenaline are examples of:","options":[{"label":"A","body":"Peptide hormones only","isCorrect":false},{"label":"B","body":"Steroid hormones","isCorrect":false},{"label":"C","body":"Monoamine neurotransmitters","isCorrect":true},{"label":"D","body":"Gaseous neurotransmitters","isCorrect":false},{"label":"E","body":"Purine nucleotides","isCorrect":false}],"explanation":"These are small‑molecule monoamine neurotransmitters involved in mood, reward, attention and more."}]}"
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