Biophysics Final

Human ear shows the highest sensitivty for sounds characterized by Frequencies:

Blood velocity in the vessels can be estimated when applying:

Indicate proper statement regarding X and gamma rays

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

Typically, the wavelength of absorbed photon is:

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

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

Indicate in which units is measured the ECG signal:

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

Sensory neurons are typically:

In the electrolyte, local intensity of electric field 

Assuming that the membrane voltage is 100 mV and the membrane thickness is 10 nm, the intensity of electric field is: 

The intracellular concentration of chloride ions is increased while the extracellular one remains unchanged. Indicate how this change will affect the value of the equilibrium potential for chloride ions (V_Cl). 

In an electrophysiological experiment the number of moles of electrical charges per membrane surface unit and per unit time is determined. The name of the physical quantity measured in this experiment is:

The phenomenon of diffusion is quantitatively described by:

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

The speed of the acoustic wave in an elastic medium is: (E - volume elasticity module, r- medium density)

The sound velocity is measured in the air, water and in a metallic crystal. The sound velocity is found to be: 

Indicate the tissue in which the speed of the acoustic wave is characterized by the largest velocity:

The sound intensity is defined as:

In the photoelectric effect the ionization of atom takes place because

Indicate a correct statement

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

Indicate how the energy of interaction between a charge and dipole depend on distance (r) between them:

The property of the sodium-potassium pump referred to as “electrogenic” is related to the fact that:

The direct impact of the electrogenic action of the sodium-potassium pump on the value of the resting membrane potential is:

When a negatively charged ion (anion) crosses the membrane from inside to outside of the membrane, the value of the membrane potential will:

A robust excess of extracellular potassium concentration ([K]_out) is known to lead to the cardiac arrest. Indicate most important cause of this effect: 

Indicate the fastest mechanism of communication between two cells

Nicotinic Acetylcholine receptors are:

Indicate the name of the disorder characterized by the following symptoms: muscle fatigability, deficit of acetylcholine receptors at the muscular endplates :

In myothonia congenita the skeletal muscle fibers are:

Considering the flow of ideal (non-viscous) fluid through a cylindric vessel, indicate how will change the velocity of the fluid flow if the vessel’s length is increased 3 times (we assume that the pressure inducing the flow does not change):

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 part of the arm kept high above the head, then the measured values of systolic/diastolic pressures will read:

When a viscous fluid is transported through a cylindrical vessel of constant diameter and under a constant pressure, 

Parameter Q defines the volume of viscous liquid transported per unit time through a cylindrical vessel. If the radius of the vessel are reduced by 50% and its length is increased twice (100% increase) how much the parameter Q will change (assuming that all other parameters including pressure and liquid viscosity remain the same) ?

Indicate the orders of magnitude for number of photoreceptors and ganglion cells in the human eye retina

A symmetrical spherical lens changed its shape by increasing the curvature radius 4 times. How such a deformation will affect the optical power ?

When the degree of order in the isolated system increases 

Thermodynamically, the process of diffusion can be regarded as