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Test

Communication Between Excitable Cells

Charlotte Jakes 14 preguntas Actualizado el 1 ene 2020

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Preguntas del test (14)

  1. 1Synapses from other neurons can only occur on the cell body or the dendrites of the next neuron.
    1. AVerdadero
    2. BFalso
  2. 2Fill in the blanks below to describe the transmission at the neuromuscular junction.
    1. An [blank_start]action potential[blank_end] arrives at the nerve terminal.
    2. [blank_start]Ca2+[blank_end] channels open and these ions diffuse into the synaptic knob.
    3. This causes vesicles containing [blank_start]acetylcholine[blank_end] to fuse with the presynaptic membrane and release the neurotransmitter into the synaptic cleft.
    4. [blank_start]Acetylcholine[blank_end] diffuses across the synaptic cleft and binds to gated [blank_start]sodium[blank_end] ion channels.
    5. [blank_start]Sodium[blank_end] ions move into the muscle cell, causing a [blank_start]depolarisation[blank_end].
    1. Aaction potential
    2. BCa2+
    3. Cacetylcholine
    4. DAcetylcholine
    5. Esodium
    6. FSodium
    7. Gdepolarisation
  3. 3Why are action potentials wider when seen at neuromuscular junctions than at regular synapses?
    1. AEntry of calcium ions into the cytosol from the SR
    2. BNo removal of potassium from the muscle cell
    3. CMore sodium ion channels so greater influx of sodium
    4. DCytosol already has a higher concentration of sodium so the influx required for depolarisation is less
  4. 4What is a sub-threshold miniature endplate potential?
    1. ATiny depolarisations of the membrane caused by the release of a single vesicle of neurotransmitter
    2. BThe resting membrane potential of a muscle cell
    3. CThe threshold of the action potential on a muscle cell (i.e. the influx of sodium required for an action potential)
    4. DThe number of sodium ion channels open on the membrane of a muscle cell at the neuromuscular junction
  5. 5Miniature endplate potentials will never exceed the threshold and produce an action potential.
    1. AVerdadero
    2. BFalso
  6. 6Fill in the blanks to describe the knee jerk reflex.
    1. Hammer depresses patellar ligament which is connected to the quadriceps.
    2. Muscle [blank_start]stretch[blank_end] receptors send [blank_start]afferent[blank_end] impulses to the [blank_start]spinal cord[blank_end].
    3. Impulse conducted to [blank_start]interneuron[blank_end].
    4. Interneuron [blank_start]activates[blank_end] efferent impulses to [blank_start]alpha[blank_end] motor neurons causing contraction of the quadricep.
    5. Interneuron [blank_start]inhibits[blank_end] efferent impulses to the [blank_start]antagonist[blank_end] muscles to facilitate extension of the knee.
    1. Astretch
    2. Bafferent
    3. Cspinal cord
    4. Dinterneuron
    5. Eactivates
    6. Falpha
    7. Ginhibits
    8. Hantagonist
  7. 7Excitatory post-synaptic potentials (EPSPs) do what?
    1. AIncrease positive charge to generate depolarisation
    2. BIncrease negative charge to generate hyperpolarisation
    3. CAlways generate an action potential
  8. 8Inhibitory post-synaptic potentials (IPSPs) do what?
    1. AIncrease positive charge to generate depolarisation
    2. BIncrease negative charge to generate hyperpolarisation
    3. CAlways cause an action potential
  9. 9Inhibitory post-synaptic potentials can be cancelled out by excitatory post-synaptic potentials.
    1. AVerdadero
    2. BFalso
  10. 10What is spatial summation?
    1. AThe combined activity of several neurons synapsing at a particular point to trigger the threshold
    2. BThe combined activity one one neuron sending multiple excitatory potentials to trigger the threshold

Información

Descripción
Principles of Physiology and Pharmacology Test sobre Communication Between Excitable Cells, creado por Charlotte Jakes el 16/12/2019.
Idioma
English
Visitas
10
Historial
Creado el 16 dic 2019 · actualizado el 1 ene 2020
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