Neural & Muscular Excitability Quest

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Test your understanding of nerve and muscle basics

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Wilmeris Iriartes

Venezuela

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Neural & Muscular Excitability Quest


Neural & Muscular Excitability QuestVersión en línea Test your understanding of nerve and muscle basics por Wilmeris Iriartes 1 What ion channels cause depolarization in a neuron when opened by voltage change? a Ligand-gated potassium channels b Voltage-gated calcium channels c Voltage-gated sodium channels d Mechanically-gated sodium channels 2 Where does a depolarization jump occur in myelinated axons, enabling rapid propagation? a Nodes of Ranvier b Soma c Axon hillock d Synaptic cleft 3 Which neurotransmitter is released at the neuromuscular junction to trigger contraction? a Acetylcholine b Glutamate c GABA d Dopamine 4 What is a motor unit? a One neuron and all the muscle fibers it innervates b A single muscle fiber c A muscle and its tendon d A group of neurons innervating one muscle 5 What does the Na+/K+ pump accomplish per cycle? a 2 Na+ out and 3 K+ in b Equal exchange of Na+ and K+ with no net charge change c 3 Na+ in and 2 K+ out d 3 Na+ out and 2 K+ in 6 What initiates the muscle contraction cycle at the sarcomere? a Calcium binding to troponin b Chloride influx c Sodium influx d Potassium efflux 7 How do myelinated fibers differ in speed of conduction compared to unmyelinated? a Unmyelinated fibers are faster b Myelinated fibers use saltatory conduction and are faster c Both have same speed d Myelin slows conduction 8 What type of transmission typically occurs at a synapse to pass the signal? a Thermal conduction b Chemical transmission via neurotransmitter c Mechanical transmission d Electrical transmission via gap junctions 9 What is the role of troponin in muscle contraction? a Binds calcium to regulate tropomyosin movement b Binds sodium to initiate action potential c Stabilizes actin filaments d Binds ATP to power contraction 10 Which receptor type is primarily involved at the neuromuscular junction? a GABA receptor b Muscarinic acetylcholine receptor c Nicotinic acetylcholine receptor d NMDA receptor Explicación 1 Sodium channels open in response to voltage changes, driving depolarization. 2 Nodes of Ranvier are gaps in myelin where action potentials are regenerated. 3 Acetylcholine binds nicotinic receptors to stimulate muscle contraction. 4 A motor unit comprises a motor neuron and the fibers it controls. 5 The pump exports 3 sodium and imports 2 potassium, creating a net outward positive current. 6 Calcium binds to troponin, moving tropomyosin to expose myosin-binding sites. 7 Saltatory conduction in myelinated fibers speeds up impulse transmission. 8 Most synapses operate chemically with neurotransmitters crossing the synaptic cleft. 9 Calcium-bound troponin shifts tropomyosin to uncover actin-myosin binding sites. 10 The nicotinic receptor at the NMJ mediates fast excitatory transmission.

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Neural & Muscular Excitability Quest

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Neural & Muscular Excitability QuestVersión en línea

por Wilmeris Iriartes

What ion channels cause depolarization in a neuron when opened by voltage change?

Where does a depolarization jump occur in myelinated axons, enabling rapid propagation?

Which neurotransmitter is released at the neuromuscular junction to trigger contraction?

What is a motor unit?

What does the Na+/K+ pump accomplish per cycle?

What initiates the muscle contraction cycle at the sarcomere?

How do myelinated fibers differ in speed of conduction compared to unmyelinated?

What type of transmission typically occurs at a synapse to pass the signal?

What is the role of troponin in muscle contraction?

Which receptor type is primarily involved at the neuromuscular junction?

Explicación