Biology

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31 Questions - Developed by: V - Developed on: - 364 taken

  • 1
    - A hyperpolarization increases efficiency of a synaptic transmission
  • 2
    - At synapse the action potentials are transmitted by “jumping“ the Ranvier nodes
  • 3
    - Chemical synapses allow both directions of neural transmission
  • 4
    - At excitatory synapse a polarization of the sub synaptic membrane increases during the transmission of the signal
  • 5
    - An activation of inhibitory synapse does not result in an occurrence of action potential on the postsynaptic neuron
  • 6
    - In a human body a synaptic transmission is based mostly upon the action of chemical mediators
  • 7
    - Mediators are released from the presynaptic membrane
  • 8
    - Mediators are bound on the voltage-gated channels of the postsynaptic membrane
  • 9
    - A neurotransmitter affects particularly the membrane potential of the postsynaptic neuron
  • 10
    - Postsynaptic local potentials are either EPSP or IPSP
  • 11
    - Postsynaptic action potentials undergo the time or the space summation
  • 12
    - Progressive depolarization of a cellular membrane due to the activation of several excitatory synapses represents the space summation (of responses)
  • 13
    - Postsynaptic potentials are excitatory when the membrane permeability for Na+ decreases
  • 14
    - A local electric event (e.g. the end plate potential) undergoes the „all or none“ law
  • 15
    - The synapses are e.g. the axo-axonal, axo-dendritic, axo-somatic, but not soma-somatic
  • 16
    - Glutamate and glycine are typical excitatory neurotransmitters
  • 17
    - GABA is a kind of typical inhibitory neurotransmitter
  • 18
    - A motor unit of skeletal muscle contracts due to activation of one motoneuron
  • 19
    - Ca2+ is a neurotransmitter of synaptic transmission being involved in a conduction from the motor nerve fiber to the muscle cell
  • 20
    - At skeletal muscle an amplitude of the action potential depends on the intensity of stimulus
  • 21
    - A high concentration of Ca2+ in the sarcoplasm reticulum and T system is required for transmission of action potential from the nerve to the muscle
  • 22
    - The myocardium cannot be activated without special conductive nerve fibers
  • 23
    - The resting membrane potential of myocardial cells depends particularly on concentration gradient of Ca2+
  • 24
    - The durations of action potential in the skeletal muscle cells and the cells of myocardium are similar and markedly shorter than the action potential duration of smooth muscle cells
  • 25
    - The prepotential is a kind of gradual hyperpolarization of cell membrane of conductive heart system due to the alterations in permeability of channels within these membranes
  • 26
    - A conductive system of the heart consists of Sino atrial node (SA), Atrio-ventricular node (AV), Tawar bundle, left and right Hiss straps, and Purkyne fibres
  • 27
    - In healthy adult heart a depolarization propagates from the atrioventricular node to atria’s and ventricles
  • 28
    -(2015) Postsynaptic do not contribute to either temporal or spatial summation
  • 29
    -(2015) Postsynaptic potentials represent local gradual(stepqise(stepwise?)) electrical response(of membrane)
  • 30
    -(2015) There are no axo somatic synapses
  • 31
    True

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