Biophysics

53) If the intracellular concentration of a cation is larger than the extracellular one, the Nernst equilibrium
potential for this ion is:
 

54) During the onset phase of action potential, the bulk electrolyte in the cytoplasm of the axon
 

55) At the resting membrane potential of a typical neuronal cell, the values of electrical driving forces for
potassium and sodium ions are approximately
 

56) If the radius of a cylindrical vessel decreases 2 fold then the haemodynamic resistance:
 

57) Fick’s law states that
 

58) Detection of signals characterized by a low frequency (tens of Hz) occurs at the basilar membrane:
 

59) Switching off the dark current in the rod takes place due to:
 

60) Ganglion cells innervating the retina beyond the fovea:
 

61) The Weber-Fechner law states that
 

62) In the case of the Nernst equilibrium
 

63) Opening of potassium channel would result in :
 

64) Indicate the appropriate association:
 

66) Total optic power of the human eye is approximately:
 

67) The distance of the object from a thick lens is calculated as:
 

68) Which of the statements below is correct
 

69) When the membrane potential is at its resting level
 

70) Inactivation of sodium channels
 

71) Which neurotransmitter is released during the neuromuscular transmission

 

72) Neuromuscular transmission results in:
 

73) Indicate where are localized the hierarchical pacemakers in the heart (starting from that working with
highest frequency):
 

74) The plateau phase of the action potential generated by a Purkynje cells lasts approximately
 

75) Choose the proper association:
 

76) For the ideal fluid, when the pressure is constant and the diameter of tube is increased 2-fold, the
velocity of flow will:
 

78) In the closed system, when the volume of the system is compressed (a small volume change V), the
internal energy will change by (p – pressure, T-temperature, k – Bolzmann constant)

 

79) The first principle of thermodynamics for ideal gas states that the change of internal energy of a closed
system is equal to:
 

80) When the function of the f channels in the sinoatrial node is increased :

 

84) The phenomenom of viscosity is related to:
 

After action potential generation in the axon:
 

86) Viscous resistance (haemodynamic resistance) is defined as:
 

87) The intensity of the electrical al field ( E= U/D, U – voltage and D – distance) within the biological membrane is close to:
 

88) When the action potential reaches its maximal (peak) value, the membrane potential reaches app. :
 

89) When the action potential reaches its minimal value (hyperpolarization), the neural membrane is:
 

90) Mechanism of accommodation is related to the properties of:
 

91) Electrical capacitance of a membrane:
 

93) Entropy is a measure of:
 

95) Decrease in potassium ion concentration in the extracellural fluid would cause:
 

96) Fick’s law states that:
 

97) Which element of the eye’s optic system shows the highest optical power…(?)..:
 

98) Detection of signals characterized by a low frequency (tens of Hz) occurs at the basilar membrane:

 

103) The lens has optic power of -5 dioptres