Medical Instrumentation Mid - I, September - 2014

1.Main two components of ionic currents for neuronal action potential are:
  • Sodium currents and potassium currents
  • Sodium currents and leakage current
  • Calcium currents and sodium currents
  • Calcium currents and leakage currents
Answer: A
2.__________ receives input from sensory receptors or from other neuron
  • Cell body
  • Soma
  • Dendrites
  • Axon
Answer: C
3.One of the electrodes is mounted on the contact lens and other electrode is placed on The cheek for recording _______________
  • Electroneurogram
  • Electromyogram
  • Electrooculogram
  • Eletroretinogram
Answer: D
4.The minimum intensity which is just adequate to elicit response is called ____
  • Stimulus
  • Impulse
  • Threshold
  • IPSP
Answer: C
5.TTX and TEA are __________ and __________ channel blockers respectively.
  • Potassium & Sodium
  • Sodium & Potassium
  • Calcium & Sodium
  • Calcium & Potassium
Answer: A
6.The presence of _____ wave in EEG of an awaken adult indicates brain damage.
  • Alpha
  • Beta
  • Delta
  • Theta
Answer: C
7.Electrodes in which no net transfer of charge occurs across metal-electrolyte interface are called
  • Surface electrodes
  • Needle electrodes
  • Perfectly Polarized electrodes
  • Non-polarizable electrodes
Answer: C
8.The metal electrolyte interface appears to consist of __________ in series with a parallel combination of capacitance and reaction resistance.
  • Inductor
  • Voltage
  • Capacitor
  • Resistor
Answer: B
9.Of the following electrodes which electrode shows low contact impedance
  • Surface electrode
  • Needle electrode
  • Metallic microelectrode
  • Non-metallic microelectrode
Answer: A
10.In ________ coupled amplifiers, the low frequency response is limited by the reactance of the interstage coupling capacitors
  • LC
  • RC
  • RL
  • RR
Answer: B
11.For faithful reproduction of biosignals, the amplifiers must have an excellent frequency response in the __________________ frequency range.
Answer: Sub Audio Frequency
12.Information from one neuron flows to another neuron across a _____________
Answer: Synapse
13.__________________ Phase of an action potential is due to the opening of voltage gated sodium channels.
Answer: Depolarisation
14.Product of membrane resistance and capacitance is equal to _______________
Answer: Time constant
15.__________________ Electrodes are used for measuring resting potential or action potential of single cell.
Answer: Microelectrodes
16.When electrode comes in contact with electrolyte the net result is creation of charge gradient, the special arrangement of which is called __________________________
Answer: Electrical double layer
17.____________________ is the graphical representation of bioelectric potentials generated by the muscles of the heart.
Answer: Electrocardiogram
18.As the action potential propagates down the fibre it cannot re-excite the portion immediately upstream due to the existence of _______________________
Answer: Refractory period
19.Membrane conductance for sodium ion can be given as GNa =_________________
Answer: INa / (V - VNa)
20.The minimum current intensity required by the stimulus for excitation of a nerve fibre is termed as __________________
Answer: Rheobasic current