Biology

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31 Questions - Developed by: V - Developed on: - 148 taken

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

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