Biophysics

142)  In the phase of repolarization during the action potential:

144)  All or nothing:

145) The reverse piezoelectric effect:

158)  The diameter of a cylindrical artery transporting a viscous fluid (blood) was reduced by 1/3 (approximately by 33%). Indicate a true sentence

160) Acetylcholine

162) The velocity propagation of the pulse wave along the arterial vessels is

163)  What happens to the optical power of a symmetrical lens if one of its curvature radii gets 50% shorter and the other remains unchanged?

165)  The closed system containing the ideal gas is expanding (increasing its volume) without exchanging heat with the environment. The internal energy of this system is:

166)  Indicate how the average kinetic energy (Ek) of gas particle is related to the gas temperature T ( in Kelvin scale):

167)  The entropy (measure of systems disorder)  is (p - pressure, Ω - number of microstates characterizing a given macrostate, V - Volume, R - gas constant, Q - Heat, T - temperature) S = k * ln (Ώ)

168)  In the state of equilibrium in the closed system the value of the free enthalpy 

169)  For the open system the chemical potential (µ) for a given compound can be described as

170)  How the osmotic pressure (according to the Vant Hoff) depends on the temperature:

171)  The change in free enthalpy (∆G) is equal to zero for:

172)  In the case of the ideal gas internal energy comprises:

173)  The considered system can be found in the two states: state S1 characterized by the energy U1 and state S2 characterized by the energy U2. If U1 > U2 then

174)  In an isolated system in which a local transfer of heat (∆Q) takes place at temperature T, the change in the entropy is given by ( U-internal energy, p-pressure, V-volume):

176)  In the interaction described by Van der Walls (A,B – constant >0, r is distance)

178)  Indicate the effect of hydrogen bonding water

179)  Indicate in which case the energy of the hydrogen bond is strongest

180)  If the wavelength is shortened by 50% and the velocity of the wave propagation is unchanged then:

181) Acoustic pressure is

182)  If an artificial membrane contains non-selective channels only (i.e. channels permeable equally to anions and cations), the resting membrane potential will take the value: (assume that electrolytes surrounding the membrane are physiological, i.e. on one side cytoplasmatic and on the other - extracellular)

183)  Indicate correct description of the voltage-clamp technique concept

185)  GABAA receptors are

187)  Corpuscular radiation is/are:

188)  Consider a probe consisting of a certain amount of one type of radioactive element. The radioactive decay law predicts that the number of nuclei of considered isotope will

190)  Indicate in which mechanism the energy of photon is totally absorbed

192)  In the Geiger-Muller counter

194)  Astigmatism takes place when:

195)  To obtain the image of a single slice of patient’s body during MRI scan one should use:

196)  Neuron is referred to as bipolar when

197)  Assuming that the membrane thickness is 5 nm and the intensity of electric field  is 2.107 V/m, the membrane voltage is:

205)  Figure presents a dipole. The value of the electrical potential at the distance R on the solid line is V(R). What would be the value of the potential when increasing the distance three times (3R) on the same direction defined by the solid line in the figure?

206)  Figure below represents a dipole. The value of the electrical potential at the location indicated as “2R” is equal to 2V. Indicate the value of the potential at the localization “R”

207)  Indicate the type of channel responsible for a slow depolarization of the diastolic potential in the sinoatrial node

209)  When ventricles are completely depolarized the ECG recording shows

210)  Repolarization of atria is represented in the ECG by

211)  Considering the flow of an ideal fluid through a cylindrical vessel, indicate how will change the velocity of the fluid flow if the vessel’s diameter is decreased 4 times (assume that the pressure inducing the flow does not change)

212)  If we measure, for the sake of experiment, the blood pressure to a subject in the standing position and the cuff is placed on the leg close to the foot, then the measured values of systolic/ diastolic pressures will read: