Biophysics

400. Human ear shows the highest sensitivity for sounds characterized by:

401. Blood velocity in the vessels can be estimated when applying:

402. Indicate proper statement regarding X and gamma rays

403. The feature that a lens focuses the light not at a focal point but at a blurred spot is referred to as:

404. Typically, the wavelength of absorbed photon is:

405. The energy of interaction between the magnetic moment and the external magnetic field is minimal when:

406. In the MRI scanning, the gradients of magnetic field are used to:

407. Indicate where in the heart tissue, the propagation of excitability occurs with the lowest velocity

408. Sensory neurons are typically:

409. Indicate a typical width of the synaptic cleft (distance between pre- and postsynaptic membrane) of a chemical synapse:

410. Which neurotransmitter is released by the mammalian rod cells in the retina:

411. Indicate the fastest mechanism of communication between two cells

412. Nicotinic Acetylcholine receptors are:

413. In myothonia congenita the skeletal muscle fibers are:

414. Which electrocardiogram wave can be attributed to the atrial diastole

415. The incoming acoustic stimulus has induced a deformation of the basilar membrane very close to the oval window. We may deduce that the detected voice

416. The mechanism underlying "one way" propagation of action potential is:

417. Indicate which effect on the action potential time course would have the impairment of the inactivation process (ex. scorpion venom) in the voltage-gated sodium channel?

418. Choose the proper association:

419. How much the sound intensity must increase to produce the sensation of increase in loudness by 200%

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

3) Considering a continuous flow of and ideal fluid through a cylindrical vessel, indicate how will change the velocity of the fluid flow if the vessel’s radius is increased 3 times (Assume that the pressure indicating the flow does not change):

4) If we measure for the sake of experiment, the aterial blood pressure to a subject in the standing position while the cuff is placed on the calf then the measured values of systolic/diastolic pressures will read:

5) We consider an artificial lipid bilayer to which some non-selective channels (channels permeable equally to anions and cations) were incorporated. The resting potential of this embrace will take the value: (assume that electrolytes surrounding the membrane are physiological, i.e. on one side cytoplasmic and on the other extracellular)

(no correct answer given in the bible)

6) When a viscous fluid is transported through a cylindrical vessel of constant diameter and under a constant pressure, the fluid velocity:

7) The diameter of a cylindrical artery transporting a viscous fluid (blood) was reduced due to the growth of an atherosclerotic plaque to 25% of its physiological value. Indicate a true sentence

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

9) What happens to the optical power of a symmetrical lens if one of its curvature radii decreases 3 times (is becoming one third of the original value) and the other re- mains unchanged?

(answer not sure)

10) Indicate correct concept of the voltage-calmp technique

11) Indicate in which case the action potential is not propagated with a constant amplitude:

12) GABA(A) receptors are:

13) Indicate how the average kinetic energy (Ek) of a gas particle is related to the gas velocity:

14) The entropy is ( p – pressure, N- number of characterizing a given macrostate, V- volume, R- gas constant, Q- heat, T- temperature):

15) For the open system the chemical potential for a given compound can be described as:

16) How the osmotic pressure (according the V ant Hoff ) depends on the temperature:

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

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

19) The considered system can be found in the two states: energy U1 and state S2 characterized by the energy U2:

(answer not sure)

20) In an isolated system which a local (i.e. within the system) transfer of heat (del- taQ) takes place at temperature T, the change in entropy, is given by (U-internal energy,p-pressure, V-volume)