Premium Partner

0 Login Register

Store 0
Library
Info
Subscriptions
Partner

Biophysics

biophysics

Question first
Answer first
Self-test

0.0 (0)

Study

Set of flashcards Details

Flashcards	50
Students	16
Language	English
Category	Medical
Level	University
Created / Updated	29.01.2017 / 12.02.2022
Licencing	Not defined
Weblink	https://card2brain.ch/box/20170129_biophysics
Embed	<iframe src="https://card2brain.ch/box/20170129_biophysics/embed" width="780" height="150" scrolling="no" frameborder="0"></iframe>

Flip-Mode

Question first
Answer first
Self-test

Study

During a hyperpolarization of the cellular membrane, the bulk (volume) electrolytic in the cytoplasm:

Shows excess of negative charges

Shows excess of Positive charges

Remains electroneutral

First it becomes electronegative and then electropositive

First it becomes electropositive and then electronegative

At the resting membrane potential of a typical neuronal cell, the values of electrical driving forces for

potassium and sodium ions are approximately

-20 mv AND 0 mv, RESPECTIVELY

-65 m V, 25 mv, respectively

0 mv, 50mv, respectively

20 mv, -120 mv, respectively

-90 mv, 50 mv, respectively

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

velocity decreases 9 times

velocity decreases 3 times

Velocity does not change

velocity increases 3 times

velocity increases 9 times

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:

Normal 120/80

Markedly lower than normal (by approx. 40Hg both systolic and diastolic)

Markedly higher than normal (by approx.. 100Hg both systolic and diastolic)

Vein pressure will be higher and arterial pressure will be lower

Vein pressure will be lower and arterial pressure will be higherr

We consider an artificial lipid bilayer to which some non-selective channels (channels permeableequally 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)

0 mv

-90 mv

-65 mv

-50 mv

50 mv

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

is constant across the entire vessel’s diameter

is the largest at the wall and smallest in the center showing exponential (increasing) velocity profile across vessel’s diameter

is the smallest close to the wall and the largest in the center showing ex - ponential velocity profile across vessel’s diameter

is the smallest close at the wall and the largest in th e center showing parabolic velocity profile across vessel’s diameter

is the largest close to the wall and the smallest in the center showing parabolic velocity profile across the vessles diameter

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

Haemodynamical resistance increased by 25 times

Haemodynamical resistance decreased by 1⁄4

Haemodynamical resistance increased 4 times

Haemodynamical resistance increased more than 100 times

Haemodynamical resistance increased 16 times

The velocity of propagation of the pulse wave along the arterial vessels is:

Inversely proportional to the square root of Young’s module and the vessel’s wall thickness

Inversely proportional to the square root of the vessel’s wall thickness

Proportional to the blood density

Proportional to the square root of the vessel’s wall thickness

Proportional to the frequency of the heart beat