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Synapses and neurotransmitters Knowledge-Based Practice

Biology · Human Body & Physiology · Biology · Nervous System & Senses

5 Biology practice questions on Synapses and neurotransmitters. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    Which characteristic distinguishes transmission at an electrical synapse from transmission at a chemical synapse?

    • A) Requirement for voltage-gated calcium ion influx to trigger signal transmission
    • B) Direct cytoplasmic continuity facilitating nearly instantaneous, bidirectional ion flow
    • C) Presence of a wide synaptic cleft that requires passive diffusion of signaling molecules
    • D) Unidirectional propagation dependent on the binding of ligands to postsynaptic receptors
  2. 2.

    Which process occurs when postsynaptic potentials triggered simultaneously by multiple distinct presynaptic terminals combine to influence the membrane potential of a single neuron?

    • A) Temporal summation
    • B) Synaptic facilitation
    • C) Spatial summation
    • D) Retrograde neurotransmission
  3. 3.

    Which physiological event typically occurs in a postsynaptic neuron when an inhibitory neurotransmitter such as gamma-aminobutyric acid (GABA) binds to its ionotropic receptors?

    • A) Depolarization of the membrane due to an influx of sodium ions
    • B) Hyperpolarization of the membrane due to an influx of chloride ions
    • C) Depolarization of the membrane due to an efflux of potassium ions
    • D) Hyperpolarization of the membrane due to an influx of calcium ions
  4. 4.

    Which mechanism is directly responsible for terminating the signaling action of acetylcholine in the synaptic cleft?

    • A) Enzymatic breakdown by acetylcholinesterase into acetate and choline
    • B) Endocytosis of intact acetylcholine vesicles by the postsynaptic membrane
    • C) Efflux of acetylcholine through voltage-gated calcium channels
    • D) Neutralization of acetylcholine by microglial antibody binding
  5. 5.

    During chemical synaptic transmission, which event occurs immediately after an action potential depolarizes the presynaptic axon terminal?

    • A) Influx of calcium ions into the presynaptic terminal through voltage-gated channels
    • B) Fusion of synaptic vesicles directly with the postsynaptic membrane
    • C) Direct diffusion of sodium ions across the synaptic cleft into the postsynaptic cell
    • D) Active transport of neurotransmitter molecules into the postsynaptic cytoplasm

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